Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
hieu va » lieu va, hieu qua
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
hieu ve » hieu van
lam su » lam so, lam vu
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ha hoi » hoa hoi, ha noi, xa hoi
du va » dau va, tu va, su va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky lang ha hoi. ((hieu ve) or (hieu va)) cac du va thanh ((lam su) OR (lai su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky lang ha hoi. ((hieu ve) OR (hieu va)) cac du va thanh ((lam su) OR (lai su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky lang ha hoi. ((hieu ve) or (hieu va)) cac du va thanh ((lam su) OR (lai su)) triet".
• Adding a wildcard symbol may retrieve word variants: su sac ky lang ha hoi. ((hieu ve) or (hieu va)) cac du va thanh ((lam su) OR (lai su)) triet*.