Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
ca viet » va viet, co viet, hoa viet
xuc va » duc va, tuc va, luc va
vi ca » vit ca, li ca, va ca

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang xa hoi. ((hieu ve) OR (hieu va)) cam ((xuc va) or (tuc xa)) hanh vi ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((hieu ve) OR (hieu va)) cam ((xuc va) OR (tuc xa)) hanh vi ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. ((hieu ve) OR (hieu va)) cam ((xuc va) or (tuc xa)) hanh vi ca viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu ve) OR (hieu va)) cam ((xuc va) or (tuc xa)) hanh vi ca viet*.