Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thien van » thi van
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
cam thuc » am thuc, nam thuc, cam thu
hieu van » hieu va, lieu va, hieu ve
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach y, sach vay
sach 2 » sach y
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) OR (thien 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 2)) nang xa hoi. ((hieu van) OR (thien van)) cam thuc dan hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach v) or (sach 2)) nang xa hoi. ((hieu van) OR (thien van)) cam thuc dan hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach v) or (sach 2)) nang xa hoi. ((hieu van) OR (thien van)) cam thuc dan hanh vi cua triet*.