Perhaps you should try some spelling variations:
thien van » thi van
nam thuc » nam thuoc, am thuc, nam thu
thuc day » thuc dan, thuc vat
cau tren » cu tren, dau tren, ca tren
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
danh vi » hanh vi, danh di, danh va
dinh vi » dinh ve, dinh viet, dinh tri
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky

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 xa hoi. ((hieu ve) or (thien van)) nam thuc day ((danh vi) OR (dinh vi)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang xa hoi. ((hieu ve) OR (thien van)) nam thuc day ((danh vi) OR (dinh vi)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang xa hoi. ((hieu ve) or (thien van)) nam thuc day ((danh vi) OR (dinh vi)) cau tren".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang xa hoi. ((hieu ve) or (thien van)) nam thuc day ((danh vi) OR (dinh vi)) cau tren*.