Perhaps you should try some spelling variations:
day thanh » dao thanh, dat thanh, da thanh
thanh doi » thanh loi, thanh moi, thanh do
nam thuc » nam thuoc, am thuc, nam thu
thuc day » thuc dan, thuc vat
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
lang xa » dang xay, lang van
lang ha » long ha
qua nam » quan nam, cua nam, quang nam
doi cua » dai cua, hoi cua
cua tuc » cua duc, cua tu, cua thuoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty ((lang xa) or (lang ha)) hoi. hieu qua nam thuc day thanh doi cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty ((lang xa) OR (lang ha)) hoi. hieu qua nam thuc day thanh doi cua tuc.
• Adding a wildcard symbol may retrieve word variants: vu sach ty ((lang xa) or (lang ha)) hoi. hieu qua nam thuc day thanh doi cua tuc*.