Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thuc ban » thuoc ban, thuc dan, thu ban
ban hanh » ban hang
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
hanh ve » hanh vi, hanh va, hanh kem
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
ve cua » le cua, de cua, te cua
cua cu » cua chu, cua cau, cua su

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 v nang xa hoi. ((hieu ve) OR (hieu qua)) nam thuc ban hanh ve cua cu~.
• Adding a wildcard symbol may retrieve word variants: vu sach v nang xa hoi. ((hieu ve) or (hieu qua)) nam thuc ban hanh ve cua cu*.