Perhaps you should try some spelling variations:
va triet » va trien, ve triet, cua triet
sach thu » sach thue, sach thieu, sach tham
sach thi » sach tai, sach thieu, sach tham
cam thuc » am thuc, nam thuc, cam thu
hanh lam » thanh lap, hanh kem, hanh va
hanh xa » hanh va, hanh ma, hanh xu
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
ve cam » ve cham, ve cac, va cam
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) OR (sach thu)) hanh xa hoi. hieu ve cam thuc va hanh lam ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thi) OR (sach thu)) hanh xa hoi. hieu ve cam thuc va hanh lam ((va triet) OR (va thiet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thi) OR (sach thu)) hanh xa hoi. hieu ve cam thuc va hanh lam ((va triet) or (va thiet))*".