Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
luc va » duc va, tuc va
loc va » hoc va
vi cua » vai cua, di cua

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