Perhaps you should try some spelling variations:
su triet » su viet, su tien
ve triet » va trien
hieu van » hieu va, thien van, lieu va
lam duc » lam duoc, pham duc, nam duoc
hoc sac » hoc sach, hoc cac, hoc mac
van lam » van nam
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
sac ky » cac ky, sai ky
cua te » cua tu
ma hoi » mai hoi, xa hoi, ma hoa

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. hieu van lam duc va hanh vi ((cua te) or (((ve triet) OR (su triet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky nang ma hoi. hieu van lam duc va hanh vi ((cua te) OR (((ve triet) OR (su triet)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sac ky nang ma hoi. hieu van lam duc va hanh vi ((cua te) or (((ve triet) OR (su triet))))".
• Adding a wildcard symbol may retrieve word variants: hoc sac ky nang ma hoi. hieu van lam duc va hanh vi ((cua te) or (((ve triet) OR (su triet))))*.