Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh lam » thanh lap, hanh kem, hanh va
bach ky » bac ky
van cam » van nam, van lam, van cau
va hanh » van hanh, va thanh, va danh
su viet » so viet
so hoc » co hoc, mo hoc, so hoa
xuc va » duc va, tuc va, luc va
lam su » lai su, lam so, lam vu
o hai » co hai, so hai, o lai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu bach ky nang ((o hai) or (so hoc)). hieu van cam xuc va hanh lam su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach ky nang ((o hai) OR (so hoc)). hieu van cam xuc va hanh lam su viet.
• Adding a wildcard symbol may retrieve word variants: vu bach ky nang ((o hai) or (so hoc)). hieu van cam xuc va hanh lam su viet*.