Perhaps you should try some spelling variations:
va thieu » va thiet, va hieu, va tieu
va triet » va thiet, va trien, ve triet
nang doc » nang luc
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky lang xa hoi. hieu va cac tuc xa ((nang doc) or (nang noi)) ((va triet) or (va thieu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky lang xa hoi. hieu va cac tuc xa ((nang doc) OR (nang noi)) ((va triet) OR (va thieu)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky lang xa hoi. hieu va cac tuc xa ((nang doc) or (nang noi)) ((va triet) or (va thieu))*.