Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
va triet » va thiet, va trien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
cam thuc » am thuc, nam thuc, cam thu
sach thu » sach thieu, sach tham, cach thuc
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
bang xa » lang xa, bang va, mang xa
vai va » mai va, dai va, hai va

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

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