Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hieu ke » hieu kem, chieu ke, hieu ky
su sach » so sach, vu sach
ke chau » ke cau, ky chau, ke chiu
v nang » va nang, vu nang, van nang
y nang » ky nang, ly nang, may nang
phu va » phuc va, phu la, phu ha
phu da » phu la, phu ha
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 ((y nang) OR (v nang)) xa hoi. hieu ke chau ((phu va) or (phu da)) hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) xa hoi. hieu ke chau ((phu va) OR (phu da)) hanh vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (v nang)) xa hoi. hieu ke chau ((phu va) or (phu da)) hanh vi va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (v nang)) xa hoi. hieu ke chau ((phu va) or (phu da)) hanh vi va triet*.