Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, cay thuc
can thuc » dan thuc, van thuc, cay thuc
day danh » day manh, dao danh, day dan
dai danh » dai dang, dao danh, loai danh
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sinh y » sinh ly
y nang » ky nang, ly nang, v 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 xa hoi. hieu ve ((cac thuc) or (can thuc)) ((day danh) OR (dai danh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh y nang xa hoi. hieu ve ((cac thuc) OR (can thuc)) ((day danh) OR (dai danh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sinh y nang xa hoi. hieu ve ((cac thuc) or (can thuc)) ((day danh) OR (dai danh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc sinh y nang xa hoi. hieu ve ((cac thuc) or (can thuc)) ((day danh) OR (dai danh)) dai cua tre*.