Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
toc sach » hoc sach, doc sach, thuoc sach
hang doi » hang di, hang loi, huong doi
cac thoi » cac toi, cac hop, cac tro
doi cuu » doi cua, doi cuoc
va hang » van hang, va nang, va lang
thoi va » hoi va, thai va, tho va
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cuu tre » cua tre, cau tren, cau treo

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