Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tang ma » mang may, tang van
va hanh » van hanh, va thanh, va danh
hoc sac » hoc sach, hoc cac, hoc mac
nang ma » sang ma, nang cao, mang may
hieu ve » hieu va, hieu van
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
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 ((nang ma) or (tang ma)) hoi. hieu ve cam xuc va hanh vi ((cua te) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky ((nang ma) OR (tang ma)) hoi. hieu ve cam xuc va hanh vi ((cua te) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: hoc sac ky ((nang ma) or (tang ma)) hoi. hieu ve cam xuc va hanh vi ((cua te) or (su triet))*.