Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
hang tai » hang va, dung tai
su sach » so sach, vu sach
so sanh » do sanh
qua cac » cua cac
cac duc » cac du, cao duc, cac dac
va hang » van hang, va nang, va lang
cuu tre » cua tre, cau tren

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) or (so sanh)) ky nang x ho. hieu qua cac duc va hang tai ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) ky nang x ho. hieu qua cac duc va hang tai ((cuu tre) OR (cau treo))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) ky nang x ho. hieu qua cac duc va hang tai ((cuu tre) OR (cau treo))*".