Perhaps you should try some spelling variations:
hieu vien » hieu viec, thieu nien, hieu tieng
hieu hien » bieu hien, dieu hien, chieu chien
san hanh » san thanh, ban hanh, van hanh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cac toc » cac toi, cac nuoc, cac thoi
x hoi » xa hoi, o hoi, x ho
ve ve » va ve, ke ve, ve ke

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 nang x hoi. ((hieu vien) OR (hieu hien)) cac toc san hanh ((ve ve) or (de ve)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. ((hieu vien) OR (hieu hien)) cac toc san hanh ((ve ve) OR (de ve)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. ((hieu vien) OR (hieu hien)) cac toc san hanh ((ve ve) or (de ve)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. ((hieu vien) OR (hieu hien)) cac toc san hanh ((ve ve) or (de ve)) triet*.