Perhaps you should try some spelling variations:
tien thanh » tien thinh, tran thanh, den thanh
hien xanh » hien hanh, hien nhanh, chieu xanh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
ung cong » dung cong, luong cong, duong cong
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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) or (tien thanh)) - hanh tang luan ((ung cong) or (dung trong)) dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (tien thanh)) - hanh tang luan ((ung cong) OR (dung trong)) dan chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (tien thanh)) - hanh tang luan ((ung cong) or (dung trong)) dan chan cau*.