Perhaps you should try some spelling variations:
ve triet » va trien, su triet
nang dau » hang dau, xang dau, nang du
hieu van » hieu va, thien van, lieu va
nang cau » nang cao, hang cau, bang cau
van cam » van nam, van lam, van cau
va hanh » van hanh, va thanh, va danh
hoc sac » hoc sach, hoc cac, hoc mac
sac ky » cac ky, sai ky
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 cau) OR (nang dau)) hoi. hieu van 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 cau) OR (nang dau)) hoi. hieu van cam xuc va hanh vi ((cua tu) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sac ky ((nang cau) OR (nang dau)) hoi. hieu van cam xuc va hanh vi ((cua tu) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: hoc sac ky ((nang cau) OR (nang dau)) hoi. hieu van cam xuc va hanh vi ((cua tu) or (ve triet))*.