Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
trinh van » trinh han, trinh quan, trinh toan
dung cong » dung trong
trang va » tran van, hang va
trinh va » trinh vat, trinh ve, trinh vi
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan tu » phan tu, han tu, chon 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: hoc hien xanh - hanh ((trang va) OR (((trinh va) OR (trinh van)))) dung cong dan chan tu~.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh ((trang va) or (((trinh va) or (trinh van)))) dung cong dan chan tu*.