Perhaps you should try some spelling variations:
thieu nang » thien nang, thieu khang, thieu quang
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
anh dinh » hanh dinh, lanh dinh, anh kinh
dinh cuu » dinh chi
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
cuu tre » cua tre, cau tren, cau treo
va anh » van anh, va danh, va hanh
du va » dau va, tu va, su va

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