Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu van
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
xa dan » ca dan, xa dai, va dan
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: te sach ky nang cao hoi. ((hieu ve) OR (hieu va)) cac tuc xa dan ca cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang cao hoi. ((hieu ve) OR (hieu va)) cac tuc xa dan ca cau tren".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang cao hoi. ((hieu ve) OR (hieu va)) cac tuc xa dan ca cau tren*.