Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cau treo » cau theo, cau triet, cau trieu
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
te sach » toc sach
xa hanh » xa thanh, xa khanh, da hanh
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu va cam tuc ((xa hanh) OR (va hanh)) ve ((cau treo) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. hieu va cam tuc ((xa hanh) OR (va hanh)) ve ((cau treo) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. hieu va cam tuc ((xa hanh) OR (va hanh)) ve ((cau treo) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. hieu va cam tuc ((xa hanh) OR (va hanh)) ve ((cau treo) or (cau tren))*.