Perhaps you should try some spelling variations:
su sach » so sach, vu sach
ky lang » ky dang, ky tang, tay lang
hieu va » lieu va, hieu qua
va cau » van cau, va cac, va dau
xac va » tac va, ac va, bac va
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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 ((ky lang) or (ky nang)) xa hoi. hieu va cau ((xac va) or (tuc va)) hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky lang) OR (ky nang)) xa hoi. hieu va cau ((xac va) OR (tuc va)) hanh vi cua tu.
• Adding a wildcard symbol may retrieve word variants: su sach ((ky lang) or (ky nang)) xa hoi. hieu va cau ((xac va) or (tuc va)) hanh vi cua tu*.