Perhaps you should try some spelling variations:
hang doi » hang di, hang loi, huong doi
dua tren » dung tren
cach tu » cach thuc
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
sach tu » sach thu, sach ty, sach uu
va hang » van hang, va nang, va lang
cuu tre » cua tre, cau tren, cau treo
nam tu » nam thu, nam thuc
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach tu) or (cach tu)) nang xa hoi. hieu va nam tu va hang doi ((cuu tre) or (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach tu) OR (cach tu)) nang xa hoi. hieu va nam tu va hang doi ((cuu tre) OR (dua tren)).
• Adding a wildcard symbol may retrieve word variants: toc ((sach tu) or (cach tu)) nang xa hoi. hieu va nam tu va hang doi ((cuu tre) or (dua tren))*.