Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
khach ty » sach ty
vu khach » vu khanh, vu khac, vay khach
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu van
mo hoc » mon hoc, co hoc
vi cua » vai cua, di cua
o hoc » co hoc, so hoc, y hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu khach ty nang ((o hoc) OR (mo hoc)). ((hieu ve) or (hieu va)) cam duc van hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ty nang ((o hoc) OR (mo hoc)). ((hieu ve) OR (hieu va)) cam duc van hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu khach ty nang ((o hoc) OR (mo hoc)). ((hieu ve) or (hieu va)) cam duc van hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: vu khach ty nang ((o hoc) OR (mo hoc)). ((hieu ve) or (hieu va)) cam duc van hanh vi cua triet*.