Perhaps you should try some spelling variations:
thien quan » trien quang, lien quan, thien van
hieu quan » hieu qua, lieu quan, lien quan
va thanh » gia thanh, ban thanh, va tinh
cau thuc » cau truc, cuu thuc, can thuc
thuc va » thuc vat, thuc dan, thuc day
sac ky » cac ky, sai ky
va cau » van cau, va dau, va cao
su sac » su sach, su cac, su xac
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. ((hieu quan) or (thien quan)) cau thuc va thanh ((va cau) OR (va cac)) theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang x hoi. ((hieu quan) OR (thien quan)) cau thuc va thanh ((va cau) OR (va cac)) theo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang x hoi. ((hieu quan) or (thien quan)) cau thuc va thanh ((va cau) OR (va cac)) theo".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang x hoi. ((hieu quan) or (thien quan)) cau thuc va thanh ((va cau) OR (va cac)) theo*.