Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
nang xay » dang xay, nganh xay, nang xuan
hieu van » hieu va, thien van, lieu va
van chat » cao chat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
van duy » van dung
duy tre » duc tre, duy tri, duy tue
xuc va » tuc va, luc va, xac va

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 xay hoi. hieu van chat ((xuc va) or (duc va)) thanh van duy tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xay hoi. hieu van chat ((xuc va) OR (duc va)) thanh van duy tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xay hoi. hieu van chat ((xuc va) or (duc va)) thanh van duy tre*.