Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
va triet » va thiet, va trien, ve triet
su triet » su viet, su tien, ve triet
nang xa » nang x, lang xa, nang ma
van tam » van tham, van tai, van tan
luu ban » luu bang, luu dan, cuu ban
luu van » cuu van, luan van, luu hanh

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

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