Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, bach hue
cach thuc » anh thuc, cac thu
su triet » su viet, su tien, ve triet
sach thu » sach thieu, sach tham, sach nha
thanh vi » thanh va, thanh ve, nhanh vi
ve cach » va cach, ve cac, ve canh
hieu ve » hieu va, hieu van
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: su ((sach thu) OR (sach thue)) bang x hoi. hieu ve cach thuc vat ((thanh vi) or (hanh vi)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach thu) OR (sach thue)) bang x hoi. hieu ve cach thuc vat ((thanh vi) OR (hanh vi)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach thu) OR (sach thue)) bang x hoi. hieu ve cach thuc vat ((thanh vi) or (hanh vi)) su triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach thu) OR (sach thue)) bang x hoi. hieu ve cach thuc vat ((thanh vi) or (hanh vi)) su triet*.