Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hien xanh » hien hanh, hien nhanh, chieu xanh
trinh qua » trinh quan, trinh cua, trinh quang
qua dung » quang dung, su dung, qua song
cong tan » cong tac, cong san, cong thanh
trong ca » trong cac, trong nha
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien xanh - hanh trinh qua dung ((cong tan) or (trong ca)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh trinh qua dung ((cong tan) OR (trong ca)) toan cau*.