Perhaps you should try some spelling variations:
hanh trua » thanh tra, hanh tu, hanh sua
trua cuu » tra cuu, trua cua, truc cau
truc va » thuc va, thuc vat, trung va
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va
nang ma » tang ma, sang ma, nang cao
cuu tre » cua tre, cau tren, cau treo
luc va » duc va, tuc va, loc va
ma hoi » mai hoi, xa hoi, ma hoa

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 ky nang ma hoi. ((hieu va) OR (hieu qua)) cham ((truc va) or (luc va)) hanh trua cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. ((hieu va) OR (hieu qua)) cham ((truc va) OR (luc va)) hanh trua cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoi. ((hieu va) OR (hieu qua)) cham ((truc va) or (luc va)) hanh trua cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoi. ((hieu va) OR (hieu qua)) cham ((truc va) or (luc va)) hanh trua cuu tre*.