Perhaps you should try some spelling variations:
hoc sach » hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, ve triet
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
cau xuc » cam xuc, cau luc, cau truc
xuc van » duc van, luc van, vuc van
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: ((hoc sach) OR (hoc sinh)) ky nang xa hoi. hieu van cau xuc van hanh vi ((cua te) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc sinh)) ky nang xa hoi. hieu van cau xuc van hanh vi ((cua te) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) OR (hoc sinh)) ky nang xa hoi. hieu van cau xuc van hanh vi ((cua te) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) OR (hoc sinh)) ky nang xa hoi. hieu van cau xuc van hanh vi ((cua te) or (va triet))*.