Perhaps you should try some spelling variations:
hang doi » hang di, hang loi, huong doi
sach thu » sach thue, sach thieu, sach tham
cam thu » nam thu, ca thu, cam phu
doi cuu » doi cua, doi cuoc
va hang » van hang, va nang, va lang
cac thu » cach thuc, cac thoi
cuu tre » cua tre, cau tren, cau treo
sach tu » cach tu, sach ty, sach uu
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma

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 (sach thu)) nang xa hoi. hieu va ((cam thu) or (cac thu)) va hang doi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach tu) OR (sach thu)) nang xa hoi. hieu va ((cam thu) OR (cac thu)) va hang doi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach tu) OR (sach thu)) nang xa hoi. hieu va ((cam thu) or (cac thu)) va hang doi cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach tu) OR (sach thu)) nang xa hoi. hieu va ((cam thu) or (cac thu)) va hang doi cuu tre*.