Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
luc van » luoc van, luu van, duc van
cam luc » cam xuc, cau luc
su sach » so sach, vu sach
hieu ve » hieu va
lang ha » long ha
nang ma » tang ma, sang ma, nang cao
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 y ((nang ma) or (lang ha)) hoi. ((hieu ve) or (hieu van)) cam luc van hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang ma) OR (lang ha)) hoi. ((hieu ve) OR (hieu van)) cam luc van hanh vi cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang ma) or (lang ha)) hoi. ((hieu ve) or (hieu van)) cam luc van hanh vi cua triet*.