Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh tai, hanh van
chat tuc » chat xuc, luat tuc, chat huu
sach ky » sac ky, sach y, sach ty
hanh va » hang va, hanh vi
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
tuc va » thuc va, truc va, tuc xa
thiet » thieu

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

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