Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh va » hang va, hanh vi
hanh vu » hanh vi, hanh tu, hanh ve
hieu ve » hieu va, hieu van
su sach » vu sach
nang xa » nang x, lang xa, nang ma
so sach » so sanh, bo sach, co sach
cac loc » cac lop, cac toc, cac hoc
ve cac » va cac, vien cac
loc va » hoc va, luc va
y nang » ky nang, ly nang, v nang

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) OR (so sach)) y nang xa hoi. hieu ve cac loc va ((hanh vu) or (hanh va)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y nang xa hoi. hieu ve cac loc va ((hanh vu) OR (hanh va)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) y nang xa hoi. hieu ve cac loc va ((hanh vu) or (hanh va)) va triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) y nang xa hoi. hieu ve cac loc va ((hanh vu) or (hanh va)) va triet*.