Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu va » lieu va, hieu qua
va tinh » may tinh
va hanh » van hanh, va thanh, va danh
cac luc » cau luc, coc luc, cac nuoc
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky nang xa hoi. ((hieu ve) OR (hieu va)) cac luc ((va hanh) or (va tinh)) vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang xa hoi. ((hieu ve) OR (hieu va)) cac luc ((va hanh) OR (va tinh)) vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang xa hoi. ((hieu ve) OR (hieu va)) cac luc ((va hanh) or (va tinh)) vi cua triet".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang xa hoi. ((hieu ve) OR (hieu va)) cac luc ((va hanh) or (va tinh)) vi cua triet*.