Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
hanh tra » thanh tra, khanh tra, hanh tram
tra cuu » tra cau, trau cua, trua cua
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, sach thu
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
cuu tre » cua tre, cau tren, cau treo
loc va » hoc va, luc va

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 ty ((nang ma) or (mang may)) hoi. hieu qua cham ((thuc va) or (loc va)) hanh tra cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((nang ma) OR (mang may)) hoi. hieu qua cham ((thuc va) OR (loc va)) hanh tra cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty ((nang ma) or (mang may)) hoi. hieu qua cham ((thuc va) or (loc va)) hanh tra cuu tre*.