Perhaps you should try some spelling variations:
"tu sach cha me giai nam phuong tinh" » "tu sach cha me giai nam phuong trinh", "tu sach cha me giai nam phuong binh", "tu sach cha me giai nam khuong tinh", "tu sach cha me giai nam phong tinh", "tu sach cha me giai cac phuong tinh", "tu sach cha me giai va phuong tinh", "tu sach nha me giai nam phuong tinh", "tu sach che me giai nam phuong tinh", "tu sach ha me giai nam phuong tinh", "tu sach cha me giai nan phuong tinh", "tu sach cha me gian nam phuong tinh", "tu sach cha me hai nam phuong tinh", "thu sach cha me giai nam phuong tinh", "te sach cha me giai nam phuong tinh", "tu cach cha me giai nam phuong tinh", "tu sach cha de giai nam phuong tinh", "tu sach cha ve giai nam phuong tinh", "tu sach cha ke giai nam phuong tinh"
"su sach tham deo giai bai thong tin" » "su sach nha deo giai bai thong tin", "su sach tham deo giai bai trong tin", "su sach tham deo giai ban thong tin", "su sach tham deo giai tai thuong tin", "su sach tham do giai bai thong tin", "su sach thai den giai bai thong tin", "su sach chat deo giai bai thong tin", "su sach tham de giai bai thong tin", "su sach tham dien giai bai thong tin", "su sach tham so giai bai thong tin", "su sach tham deo gia ba thong tin", "so sach tham deo giai bai thong tin", "vu sach tham deo giai bai thong tin"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("tu sach cha me giai nam phuong tinh") or ("su sach tham deo giai bai thong tin"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("tu sach cha me giai nam phuong tinh") OR ("su sach tham deo giai bai thong tin")).
• Removing quotes may allow a broader search: (( tu sach cha me giai nam phuong tinh ) or ( su sach tham deo giai bai thong tin )).
• Adding a wildcard symbol may retrieve word variants: (("tu sach cha me giai nam phuong tinh") or ("su sach tham deo giai bai thong tin"))*.