Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hoc sac » hoc sach, hoc cac, hoc mac
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, me hoi
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sac ky nang ((ma hoi) or (ma hoa)). hieu ve cam xuc va hanh vi ((cua tu) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky nang ((ma hoi) OR (ma hoa)). hieu ve cam xuc va hanh vi ((cua tu) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: hoc sac ky nang ((ma hoi) or (ma hoa)). hieu ve cam xuc va hanh vi ((cua tu) or (ve triet))*.