Perhaps you should try some spelling variations:
doanh va » doan va, doanh tai, doanh cua
toc sach » hoc sach, doc sach, thuoc sach
va doanh » van doanh, vay doanh, va danh
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
thuc va » thuc vat, thuc dan, thuc day
chu tre » cho tre, chu tri, cuu tre
dong ha » dong hoa, dong va, dong hoc
dang ha » dung ha, lang ha, tang ha
va chu » va che, va cau, va chi

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) OR (toc sach)) y ((dang ha) or (dong ha)) hoi. hieu van nam thuc va doanh va chu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) y ((dang ha) OR (dong ha)) hoi. hieu van nam thuc va doanh va chu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) y ((dang ha) or (dong ha)) hoi. hieu van nam thuc va doanh va chu tre*".