Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
bach ky » bac ky
hieu va » lieu va, hieu qua
so hoc » co hoc, mo hoc, so hoa
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
lam su » lam so, lam vu
o hoi » co hoi, o hoc, o hai

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 hoi) or (so hoc)). hieu va cam xuc va thanh ((lam su) OR (lai su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach ky nang ((o hoi) OR (so hoc)). hieu va cam xuc va thanh ((lam su) OR (lai su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu bach ky nang ((o hoi) or (so hoc)). hieu va cam xuc va thanh ((lam su) OR (lai su)) triet".
• Adding a wildcard symbol may retrieve word variants: vu bach ky nang ((o hoi) or (so hoc)). hieu va cam xuc va thanh ((lam su) OR (lai su)) triet*.