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, nang ma
sang ma » tang ma, nang ma, sang tao
cao duc » dao duc, cao suc, giao duc
duc van » duc va, duc tan, duc manh
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 (sang ma)) hoi. hieu vien cao duc 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 (sang ma)) hoi. hieu vien cao duc van hanh ((lai cua) OR (dai cua)) triet.
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (sang ma)) hoi. hieu vien cao duc van hanh ((lai cua) or (dai cua)) triet*.