Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien dai » hien dai
sach kem » hanh kem
van hanh » van thanh, ban hanh, van anh
va danh » va dinh, va dan, va hanh
dai toc » dan toc, dai hoc, dai luoc
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
su tien » su kien, su hien, tu tieng
ki su » ky su

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 kem) or (sach ty)) nang xa hoi. hieu vien dai toc ((van hanh) or (va danh)) ki su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach kem) OR (sach ty)) nang xa hoi. hieu vien dai toc ((van hanh) OR (va danh)) ki su tien.
• Adding a wildcard symbol may retrieve word variants: su ((sach kem) or (sach ty)) nang xa hoi. hieu vien dai toc ((van hanh) or (va danh)) ki su tien*.