Perhaps you should try some spelling variations:
sach tay » xach tay, sach hay, sach nay
tay lang » tai lang, tay tang, tay quang
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
so sach » so sanh, bo sach, co sach
thuc va » thuc vat, thuc dan, thuc day
va dan » ca dan, va dao, va dau
dan de » dan den, dang de, van de
de cua » le cua, te cua, dieu cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach tay lang ((xa hoi) or (ha noi)). hieu van nam thuc va dan de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tay lang ((xa hoi) OR (ha noi)). hieu van nam thuc va dan de cua te.
• Adding a wildcard symbol may retrieve word variants: so sach tay lang ((xa hoi) or (ha noi)). hieu van nam thuc va dan de cua te*.