Perhaps you should try some spelling variations:
thien van » thi van
nam thuc » nam thuoc, am thuc, nam thu
cau tren » dau tren, ca tren, cau treo
day danh » day manh, dai danh, dao danh
thuc day » thuc dan, thuc vat
danh vi » hanh vi, dinh vi, danh di
cu tren » tu tren, dua tren
hieu ve » hieu va, hieu van
sac ky » cac ky, sai ky
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 ve) or (thien van)) nam thuc day danh vi ((cau tren) OR (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang x hoi. ((hieu ve) OR (thien van)) nam thuc day danh vi ((cau tren) OR (cu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang x hoi. ((hieu ve) or (thien van)) nam thuc day danh vi ((cau tren) OR (cu tren))".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang x hoi. ((hieu ve) or (thien van)) nam thuc day danh vi ((cau tren) OR (cu tren))*.