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

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

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