Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cam » vien cac, vien cao, vien nam
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
lai cua » hai cua, lai chau, thai cua
su sach » so sach, vu sach
tuc va » thuc va, truc va, tuc xa

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 cam tuc va 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 cam tuc va hanh ((lai cua) OR (dai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) OR (nang ma)) hoi. hieu vien cam tuc va 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 cam tuc va hanh ((lai cua) or (dai cua)) triet*.