Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
nam thuc » nam thuoc, am thuc, nam thu
te sach » toc sach
hanh ve » hanh vi, hanh va, hanh kem
hieu ve » hieu va, hieu van
tu tong » tu tuong, tu trong, tu dong
tu nong » tu dong, tu cong, tu tuong
cua tuc » cua duc, cua tu, cua thuoc
ve nam » he nam, va nam, le nam
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: te sach ((tu nong) OR (tu tong)) xa hoi. hieu ve nam thuc vat hanh ve ((cua te) OR (cua tuc))~.
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nong) or (tu tong)) xa hoi. hieu ve nam thuc vat hanh ve ((cua te) or (cua tuc))*.