Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hang vi » hang va, hanh vi, khang voi
hang di » hang doi, hang dien, hang dich
toc van » hoc van, toc san, tac van
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
cac toc » cac toi, cac nuoc, cac thoi
ve cac » va cac, vien cac
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((y nang) OR (v nang)) xa hoi. hieu ve cac toc van ((hang di) or (hang vi)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((y nang) OR (v nang)) xa hoi. hieu ve cac toc van ((hang di) OR (hang vi)) va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((y nang) OR (v nang)) xa hoi. hieu ve cac toc van ((hang di) or (hang vi)) va triet*".