Perhaps you should try some spelling variations:
thanh lam » thanh lap, hanh lam, thanh nam
va thanh » gia thanh, ban thanh, va tinh
bach ky » bac ky
van cam » van nam, van cau, van dam
van lam » van nam
su viet » so viet
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 (co hoc)). hieu ((van cam) OR (van lam)) xuc va thanh lam su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach ky nang ((o hai) OR (co hoc)). hieu ((van cam) OR (van lam)) xuc va thanh lam su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu bach ky nang ((o hai) or (co hoc)). hieu ((van cam) OR (van lam)) xuc va thanh lam su viet".
• Adding a wildcard symbol may retrieve word variants: vu bach ky nang ((o hai) or (co hoc)). hieu ((van cam) OR (van lam)) xuc va thanh lam su viet*.