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
thai cua » than cua, tai cuc, tri cua
nang ma » tang ma, sang ma, nang cao
cao suc » cao su, cao duc
suc van » su van, duc van, luc van
nang xa » nang x, lang xa, mang xa
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 suc van hanh ((thai 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 suc van hanh ((thai 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 suc van hanh ((thai cua) or (dai cua)) triet*.