Perhaps you should try some spelling variations:
thien van » thi van
van thanh » ban thanh, van tuan
va triet » va trien, ve triet, cua triet
thanh vi » hanh vi, thanh va, thanh ve
luc van » luoc van, luu van, duc van
sang ky » sang kyo, dang ky, tang ky
nang co » nang cao, nang doc, nang noi
nam luc » nang luc, nhan luc, nam thuc
san ky » van ky, dan ky, ban ky
co hoi » co hoc, co loi
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((san ky) or (sang ky)) nang co hoi. thien van nam luc van thanh vi ((va triet) OR (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((san ky) OR (sang ky)) nang co hoi. thien van nam luc van thanh vi ((va triet) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((san ky) or (sang ky)) nang co hoi. thien van nam luc van thanh vi ((va triet) OR (va thiet))".
• Adding a wildcard symbol may retrieve word variants: te ((san ky) or (sang ky)) nang co hoi. thien van nam luc van thanh vi ((va triet) OR (va thiet))*.