Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va triet » va trien, ve triet, cua triet
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
thiet » thieu

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 (co sach)) y nang xa hoi. hieu van cam tuc va hanh vi ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) y nang xa hoi. hieu van cam tuc va hanh vi ((va triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) y nang xa hoi. hieu van cam tuc va hanh vi ((va triet) or (va thiet))*.