Perhaps you should try some spelling variations:
dang hanh » dang thanh, ban hanh, dang van
dan hanh » dan khanh, dan thanh, ban hanh
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
co hoi » co hoc, co loi
ve am » va am

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach y) or (sac ky)) nang co hoi. hieu ve am thuc ((dan hanh) or (dang hanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (sac ky)) nang co hoi. hieu ve am thuc ((dan hanh) OR (dang hanh)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach y) or (sac ky)) nang co hoi. hieu ve am thuc ((dan hanh) or (dang hanh)) dai cua tre*.