Perhaps you should try some spelling variations:
ve triet » va trien, su triet
lang mai » lang dai, lang hai, lang man
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
va hanh » van hanh, va thanh, va danh
hoc sac » hoc sach, hoc cac, hoc mac
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
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 sac ky lang mai hoi. hieu ve ((cam xuc) or (cac nuoc)) va hanh vi ((cua te) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky lang mai hoi. hieu ve ((cam xuc) OR (cac nuoc)) va hanh vi ((cua te) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: hoc sac ky lang mai hoi. hieu ve ((cam xuc) or (cac nuoc)) va hanh vi ((cua te) or (ve triet))*.