Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cao » vien cac, vien dai, vien da
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
cao tuc » dao tuc, cao duc, cao suc
tuc van » thuc van, truc van, tuc va
lai cua » hai cua, lai chau, thai cua
su sach » so sach, vu sach

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 y ((nang xa) or (nang ma)) hoi. hieu vien cao tuc van hanh ((lai cua) or (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (nang ma)) hoi. hieu vien cao tuc van hanh ((lai cua) OR (dai cua)) triet.
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (nang ma)) hoi. hieu vien cao tuc van hanh ((lai cua) or (dai cua)) triet*.