Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
co hoi » co hoc, co loi
ve cac » va cac, vien cac
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao
ca cau » cua cau, cac cau, can cau

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 ky nang co hoi. hieu ve cac tuc ((va dan) or (ca dan)) ca cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang co hoi. hieu ve cac tuc ((va dan) OR (ca dan)) ca cau tren.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang co hoi. hieu ve cac tuc ((va dan) or (ca dan)) ca cau tren*.