Perhaps you should try some spelling variations:
thanh tung » thanh cong
hien xanh » hien hanh, hien nhanh, chieu xanh
va trong » va truong, va tuong, va trung
va thong » va thuong, va phuong, he thong
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan cau » phan dau, phan cac, phan tu

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 - ((thanh trung) or (thanh tung)) ((va trong) OR (va thong)) cong tan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - ((thanh trung) OR (thanh tung)) ((va trong) OR (va thong)) cong tan phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - ((thanh trung) or (thanh tung)) ((va trong) OR (va thong)) cong tan phan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((thanh trung) or (thanh tung)) ((va trong) OR (va thong)) cong tan phan cau*.