Perhaps you should try some spelling variations:
cam truc » cau truc, nam truc, lam truoc
va triet » va thiet, va trien, ve triet
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
cua te » cua tu

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 dang xa hoi. hieu va cam truc ((va danh) OR (va hanh)) sai ((va triet) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky dang xa hoi. hieu va cam truc ((va danh) OR (va hanh)) sai ((va triet) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky dang xa hoi. hieu va cam truc ((va danh) OR (va hanh)) sai ((va triet) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sac ky dang xa hoi. hieu va cam truc ((va danh) OR (va hanh)) sai ((va triet) or (cua te))*.