Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ve triet » va trien, su triet
cam thuc » am thuc, nam thuc, cam thu
thi nang » thi cong, ki nang, thi hanh
van hang » van khang, van hoang, van thang
thuc van » thuc vat, thuc dan, thuc va
hang vi » hang va, hanh vi, hang di
so sach » bo sach, co sach, hoc sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
so sanh » do sanh
ve cam » ve cham, ve cac, va cam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) thi nang xa hoi. hieu ve cam thuc van hang vi ((cua triet) OR (ve triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (so sanh)) thi nang xa hoi. hieu ve cam thuc van hang vi ((cua triet) or (ve triet))~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (so sanh)) thi nang xa hoi. hieu ve cam thuc van hang vi ((cua triet) or (ve triet))*.