Perhaps you should try some spelling variations:
cho hang » cho thanh, cho phan, thi hang
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
han tai » hang tai, nhan tai, van tai
hieu va » lieu va, hieu qua
lo hang » ly hang, le hang, le thang
cuu tre » cau tren, cau treo
cac tu » cac thu, cach tu, cac du
va han » va phan, van han, va hanh

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