Perhaps you should try some spelling variations:
tan hanh » tan thanh, tang hanh, toan hanh
cau treo » cau theo, cau tren, cau triet
tu sach » thu sach, su sach, te sach
ky tang » ky dang, kho tang, ky trong
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao

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 tang) or (ky nang)) xa hoi. hieu va cam duc tan hanh vi ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky tang) OR (ky nang)) xa hoi. hieu va cam duc tan hanh vi ((cua tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky tang) or (ky nang)) xa hoi. hieu va cam duc tan hanh vi ((cua tre) or (cau treo))*.