Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach tham
cam thuc » nam thuc, cam thu, can thuc
hanh dam » thanh dam, hanh lam, hanh nam
me triet » ve triet, mao triet, mon triet
hanh xa » hanh va, hanh ma, hanh xu
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh

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) or (sach thieu)) hanh xa hoi. hieu ve ((cam thuc) OR (am thuc)) va hanh dam me triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thi) OR (sach thieu)) hanh xa hoi. hieu ve ((cam thuc) OR (am thuc)) va hanh dam me triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thi) or (sach thieu)) hanh xa hoi. hieu ve ((cam thuc) OR (am thuc)) va hanh dam me triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thi) or (sach thieu)) hanh xa hoi. hieu ve ((cam thuc) OR (am thuc)) va hanh dam me triet*.