Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh de, thanh do
va thanh » gia thanh, ban thanh, va tinh
dang xay » dang van, van xay
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
qua nam » quan nam, cua nam, quang nam
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((nang xa) or (dang xay)) hoi. hieu qua nam thuc va thanh di ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (dang xay)) hoi. hieu qua nam thuc va thanh di ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (dang xay)) hoi. hieu qua nam thuc va thanh di ((cua te) or (cua tu))*.