Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
su sach » vu sach
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac tac » cac toc, cac dac, cac tai
cac bac » cac bai, cac ban, cac cach
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
vi va » vi van, vai va, vu va

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 va ((cac tac) or (cac bac)) va hanh vi 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 va ((cac tac) OR (cac bac)) va hanh vi va triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) y nang xa hoi. hieu va ((cac tac) or (cac bac)) va hanh vi va triet*.