Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
dam thuc » am thuc, dan thuc, nam thuc
hanh dam » thanh dam, hanh lam, hanh nam
tu sach » thu sach, su sach, te sach
hanh xa » hanh va, hanh ma, hanh xu
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
dam va » dam van, nam va, dam ha
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: tu sach thi hanh xa hoi. ((hieu ve) or (hieu qua)) ((dam thuc) or (cam xuc)) va hanh dam va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi hanh xa hoi. ((hieu ve) OR (hieu qua)) ((dam thuc) OR (cam xuc)) va hanh dam va thiet.
• Adding a wildcard symbol may retrieve word variants: tu sach thi hanh xa hoi. ((hieu ve) or (hieu qua)) ((dam thuc) or (cam xuc)) va hanh dam va thiet*.