Perhaps you should try some spelling variations:
thieu nang » thien nang, thieu khang, thieu quang
cac thuc » cach thuc, cac thu, can thuc
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thieu nang xa hoi. ((hieu va) OR (lieu va)) cac thuc dan hanh ((vai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thieu nang xa hoi. ((hieu va) OR (lieu va)) cac thuc dan hanh ((vai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thieu nang xa hoi. ((hieu va) OR (lieu va)) cac thuc dan hanh ((vai cua) or (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach thieu nang xa hoi. ((hieu va) OR (lieu va)) cac thuc dan hanh ((vai cua) or (hai cua)) tre*.