Perhaps you should try some spelling variations:
sach tham » sach nha
tinh gian » tinh gia, tinh giao, trinh giang
sach thu » sach thue, sach thieu, cach thuc
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
gian cua » gian xu, ban cua
sach tu » cach tu, sach ty, sach uu
duc may » duc mau, duc man, duc manh
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach tu) or (((sach thu) OR (sach tham)))) nang x ho. hieu van pham duc may tinh gian cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tu) OR (((sach thu) OR (sach tham)))) nang x ho. hieu van pham duc may tinh gian cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach tu) or (((sach thu) OR (sach tham)))) nang x ho. hieu van pham duc may tinh gian cua te".
• Adding a wildcard symbol may retrieve word variants: te ((sach tu) or (((sach thu) OR (sach tham)))) nang x ho. hieu van pham duc may tinh gian cua te*.