Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
danh sai » dung sai, danh bat, danh dau
danh dai » danh dau, danh di, vanh dai
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sinh ((y nang) or (v nang)) xa hoi. hieu ve cac thuc va ((danh dai) OR (danh sai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh ((y nang) OR (v nang)) xa hoi. hieu ve cac thuc va ((danh dai) OR (danh sai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sinh ((y nang) or (v nang)) xa hoi. hieu ve cac thuc va ((danh dai) OR (danh sai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc sinh ((y nang) or (v nang)) xa hoi. hieu ve cac thuc va ((danh dai) OR (danh sai)) cua tre*.