Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
vu sach » vu bach, su sach, vu khach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu he » hieu ve, hiem he, hieu le
sach ty » sach y, sach tu, sach thu
thuc va » thuc vat, thuc dan, thuc day
va tinh » may tinh
de cua » le cua, te cua, dieu cua
di cua » dai cua, doi cua, do cua
he nam » ha nam, nghe nam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty ((nang xa) OR (lang xa)) hoi. hieu he nam thuc va tinh ((di cua) OR (de cua)) tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty ((nang xa) OR (lang xa)) hoi. hieu he nam thuc va tinh ((di cua) or (de cua)) tu~".
• Adding a wildcard symbol may retrieve word variants: vu sach ty ((nang xa) OR (lang xa)) hoi. hieu he nam thuc va tinh ((di cua) or (de cua)) tu*.