Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
chat tuc » chat xuc, luat tuc, chat huu
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
hieu va » hieu qua
tuc va » thuc va, truc va, tuc xa
va dao » ca dao
ma hoi » mai hoi, xa hoi, ma hoa

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 ma hoi. ((hieu va) or (lieu va)) chat tuc va dao tao ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. ((hieu va) OR (lieu va)) chat tuc va dao tao ((cuu tre) OR (cau treo))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoi. ((hieu va) or (lieu va)) chat tuc va dao tao ((cuu tre) OR (cau treo))*".