Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu vien » hieu hien, hieu viec, thieu nien
hang tai » hang va, dung tai
vien cac » vien bach, vien dai, vien da
hanh tai » thanh tai, han tai, hinh tai
te sach » toc sach
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
so van » su van, vo van
lo van » le van, vo van, do van

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang xa hoi. hieu vien cac ((lo van) OR (so van)) ((hanh tai) OR (hang tai)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang xa hoi. hieu vien cac ((lo van) OR (so van)) ((hanh tai) or (hang tai)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang xa hoi. hieu vien cac ((lo van) OR (so van)) ((hanh tai) or (hang tai)) cua triet*.