Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thuc va » thuc vat, thuc dan, thuc day
truc va » thuc vat, trung va
su sach » so sach, vu sach
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, ve cai
vi cua » vai cua, di cua
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu ((ve cam) or (va cam)) ((truc va) or (thuc va)) hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. hieu ((ve cam) OR (va cam)) ((truc va) OR (thuc va)) hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu ((ve cam) or (va cam)) ((truc va) or (thuc va)) hanh vi cua viet*.