Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu hang » thi hang, thuc hanh, thu huong
cam truc » cau truc, nam truc, lam truoc
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
ve triet » va trien, su triet
su sach » so sach, vu sach
hang xa » hoang xa, hang va, hang ca
hieu ve » hieu va, hieu van
dai ve » dap ve, dau ve, dai 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 hang xa hoi. ((hieu ve) or (hieu qua)) cam truc van hanh dai ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu hang xa hoi. ((hieu ve) OR (hieu qua)) cam truc van hanh dai ve triet.
• Adding a wildcard symbol may retrieve word variants: su sach thu hang xa hoi. ((hieu ve) or (hieu qua)) cam truc van hanh dai ve triet*.