Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
nam tuc » nam thuc, nam truc, nam thuoc
nam tu » nam thu, nam thuc
va dan » ca dan, va dao, va dau
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: tu sach ky nang cao hoi. hieu ve ((nam tuc) or (nam tu)) va dan ca cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cao hoi. hieu ve ((nam tuc) OR (nam tu)) va dan ca cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cao hoi. hieu ve ((nam tuc) or (nam tu)) va dan ca cau tren*.