Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
thuoc ma » hoc ma, duoc ma
tang mai » tang ma, tang tai, lang mai
hieu cua » hieu qua, dieu cua, bieu cua
thuc va » thuc vat, thuc dan, thuc day
hanh ve » hanh vi, hanh va, hanh kem
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
cua nam » cua tam, cua ngan, cua nhan
mai hoi » mai khoi, dai hoi, lai hoi
ly tang » le tang, ly hang, ly vang
cuu tre » cua tre, cau tren, cau treo

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 ly tang mai hoi. hieu cua nam ((thuoc ma) or (thuc va)) ((thanh van) or (hanh ve)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly tang mai hoi. hieu cua nam ((thuoc ma) OR (thuc va)) ((thanh van) OR (hanh ve)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ly tang mai hoi. hieu cua nam ((thuoc ma) or (thuc va)) ((thanh van) or (hanh ve)) cuu tre*.