Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
va dinh » van dinh, va kinh, va tinh
va danh » va dan, va hanh, dia danh
bach ty » sach ty, xach tay, bach thu
nang xa » lang xa, nang ma, mang xa
tu cua » hu cua, vu cua
cua te » cua tu

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 bach ty ((nang xa) OR (nang x)) hoi. hieu van nam thuc ((va danh) OR (va dinh)) tu cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu bach ty ((nang xa) OR (nang x)) hoi. hieu van nam thuc ((va danh) or (va dinh)) tu cua te~".
• Adding a wildcard symbol may retrieve word variants: vu bach ty ((nang xa) OR (nang x)) hoi. hieu van nam thuc ((va danh) or (va dinh)) tu cua te*.