Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
hanh han » hanh nhan, hanh phan, hanh san
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
sach v » sach va, sach y, sach vay
sach 2 » sach y
han vi » hanh vi, han vui, hang vi
vi cua » vai cua, di cua

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 v) or (sach 2)) nang xa hoi. hieu van cam thuc hanh han vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach v) OR (sach 2)) nang xa hoi. hieu van cam thuc hanh han vi cua triet.
• Adding a wildcard symbol may retrieve word variants: su ((sach v) or (sach 2)) nang xa hoi. hieu van cam thuc hanh han vi cua triet*.