Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
su triet » su viet, su tien, ve triet
sach thu » sach thue, sach thieu, sach tham
thanh vi » thanh va, thanh ve, nhanh vi
hieu van » hieu va, thien van, lieu va
thu bang » thu ban, thu hang, chu bang
hieu ve » hieu va
so sach » so sanh, bo sach, co sach
bang x » nang x, bang _, bang 2
x hoi » xa hoi, o hoi, x ho

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

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