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
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
lang xa » lang ha, dang xay, lang van
van cam » van nam, van lam, van cau
sach v » sach va, sach 2, sach vay
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 y)) lang xa hoi. hieu van cam thuc dan hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach v) OR (sach y)) lang xa hoi. hieu van cam thuc dan hanh vi cua triet.
• Adding a wildcard symbol may retrieve word variants: su ((sach v) or (sach y)) lang xa hoi. hieu van cam thuc dan hanh vi cua triet*.