Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dan hanh » dang hanh, dan khanh, dan thanh
nam hoc » nam moc, nam hoi, am hoc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
sach v » sach va, sach y, sach vay
sach 2 » sach y
ve nam » he nam, va nam, le nam
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) OR (nang ma)) hoi. hieu ve nam hoc 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) OR (nang ma)) hoi. hieu ve nam hoc 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) OR (nang ma)) hoi. hieu ve nam hoc dan hanh vi cua triet*".