Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
hanh dai » hanh tai, hanh dao, vanh dai
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
chuc va » thuc vat
thuc va » thuc vat, thuc dan, thuc day
ma hoi » mai hoi, xa hoi, ma hoa
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thu nang ma hoi. hieu van pham ((chuc va) or (thuc va)) hanh dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu nang ma hoi. hieu van pham ((chuc va) OR (thuc va)) hanh dai cua tu.
• Adding a wildcard symbol may retrieve word variants: so sach thu nang ma hoi. hieu van pham ((chuc va) or (thuc va)) hanh dai cua tu*.