Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
thue nang » thien nang, thuat nang, thi nang
toc sach » hoc sach, doc sach, thuoc sach
dinh cuu » dinh chi
va dinh » van dinh, va kinh, va tinh
va danh » va dan, va hanh, dia danh
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
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 thue nang xa hoi. ((hieu va) or (hieu qua)) cac du ((va danh) OR (va dinh)) dinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thue nang xa hoi. ((hieu va) OR (hieu qua)) cac du ((va danh) OR (va dinh)) dinh cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach thue nang xa hoi. ((hieu va) or (hieu qua)) cac du ((va danh) OR (va dinh)) dinh cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc sach thue nang xa hoi. ((hieu va) or (hieu qua)) cac du ((va danh) OR (va dinh)) dinh cuu tre*.