Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
van hanh » van thanh, ban hanh, van anh
sach thu » sach thue, sach thieu, sach tham
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, xach tay
qua dam » cua dam, qua da, dua dam
nang xa » nang x, lang xa, nang ma
dam tu » nam tu, cam tu, tam tu
tu van » tu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) or (sach thu)) nang xa hoi. hieu qua dam tu van hanh vi ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thu)) nang xa hoi. hieu qua dam tu van hanh vi ((cua tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach thu)) nang xa hoi. hieu qua dam tu van hanh vi ((cua tre) or (cau treo))*.