Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
hanh tang » hanh trang, hanh mang, hanh tung
song hanh » hong hanh, dong thanh, cong thanh
song minh » tong minh, hoang minh, thong minh
anh tang » anh bang, anh dang, anh nang
toan cau » toan cao, toan ban, toan tap
va dung » van dung, va duong, vat dung

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 tang) OR (anh tang)) va dung ((song hanh) or (song minh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - ((hanh tang) OR (anh tang)) va dung ((song hanh) OR (song minh)) toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - ((hanh tang) OR (anh tang)) va dung ((song hanh) or (song minh)) toan cau*".