Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
ban hang » ngan hang
tu sach » su sach, te sach, tu cach
hang vi » hang va, hanh vi, hang di
tuc ban » thuc ban, truc ban, tu ban
cuu tre » cua tre, cau tren, cau treo
tang xa » trang xa, tang ma, lang xa
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
vi cuu » vi luu, vinh cuu

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) OR (thu sach)) 6 tang xa hoi. hieu ((ve cam) or (ve cac)) tuc ban hang vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) 6 tang xa hoi. hieu ((ve cam) OR (ve cac)) tuc ban hang vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) 6 tang xa hoi. hieu ((ve cam) or (ve cac)) tuc ban hang vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) 6 tang xa hoi. hieu ((ve cam) or (ve cac)) tuc ban hang vi cuu tre*.