Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
toc sach » hoc sach, doc sach, thuoc sach
sach ky » sac ky, sach y, sach ty
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
hieu ve » hieu van
cao hoi » cau hoi, co hoi, cao hoc
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang cao hoi. ((hieu ve) or (hieu va)) cam ((xuc va) or (luc va)) thanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang cao hoi. ((hieu ve) OR (hieu va)) cam ((xuc va) OR (luc va)) thanh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang cao hoi. ((hieu ve) or (hieu va)) cam ((xuc va) or (luc va)) thanh tai cuu tre*.