Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
hien cac » thien cac, vien cac, hieu cac
tuc van » thuc van, truc van, tuc va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
cac tuc » cac toc, cac tu, cac tac
vai va » mai va, hai va, lai va
dai va » mai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky dang xay hoi. hieu hien cac tuc van hanh ((vai va) or (dai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xay hoi. hieu hien cac tuc van hanh ((vai va) OR (dai va)) triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xay hoi. hieu hien cac tuc van hanh ((vai va) or (dai va)) triet*.