Perhaps you should try some spelling variations:
thien van » thi van
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
truc va » thuc va, thuc vat, trung va
su sach » so sach, vu sach
ly vang » ly hang, ly van, ly quang
ly nang » ky nang, ly hang, ly quang
van cam » van nam, van lam, van cau

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 ((ly nang) OR (ly vang)) xa hoi. thien van cam ((duc va) or (truc va)) hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly nang) OR (ly vang)) xa hoi. thien van cam ((duc va) OR (truc va)) hanh vai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly nang) OR (ly vang)) xa hoi. thien van cam ((duc va) or (truc va)) hanh vai cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly nang) OR (ly vang)) xa hoi. thien van cam ((duc va) or (truc va)) hanh vai cua viet*.