Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu vien » hieu hien, hieu viec, hieu tieng
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
cam tuc » cam xuc, cam tu, nam thuc
tuc van » thuc van, truc van, tuc va
lai cua » hai cua, lai chau, thai cua
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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 x hoi. ((hieu vien) or (thieu nien)) cam 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 x hoi. ((hieu vien) OR (thieu nien)) cam tuc van hanh ((lai cua) OR (dai cua)) triet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. ((hieu vien) or (thieu nien)) cam tuc van hanh ((lai cua) or (dai cua)) triet*.