Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
hien nhanh » hien hanh, tien thanh, dien thanh
hanh tang » hanh trang, hanh mang, hanh tung
chua bang » chu bang, chua nang, chua xang
bang cong » dang cong, bang song, hang cong
anh tang » anh bang, anh dang, anh nang
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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 nhanh) or (thien thanh)) - ((hanh tang) OR (anh tang)) chua bang cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien nhanh) OR (thien thanh)) - ((hanh tang) OR (anh tang)) chua bang cong dan toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien nhanh) or (thien thanh)) - ((hanh tang) OR (anh tang)) chua bang cong dan toan cau*".