Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
cua cau » cua cac, cua chu, cua cay
tuc va » thuc va, truc va, duc va
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. hieu van cam ((tuc va) OR (tuc xa)) thanh tai ((cua te) or (cua cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu van cam ((tuc va) OR (tuc xa)) thanh tai ((cua te) OR (cua cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu van cam ((tuc va) OR (tuc xa)) thanh tai ((cua te) or (cua cau))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu van cam ((tuc va) OR (tuc xa)) thanh tai ((cua te) or (cua cau))*.