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