Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh dai » hanh tai, hanh dao, vanh dai
ban hanh » ban hang
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau treo
cac cua » cach cua, cac qua, ca cua
tu sach » thu sach, su sach, te sach
cac cuc » cac cuoc, cac nuoc, cac cach
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. hieu ve ((cac cuc) OR (cac cua)) ban hanh dai ((cuu tre) OR (cau tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xa hoi. hieu ve ((cac cuc) or (cac cua)) ban hanh dai ((cuu tre) OR (cau tren))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. hieu ve ((cac cuc) or (cac cua)) ban hanh dai ((cuu tre) OR (cau tren))*.