Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
toan thanh » tran thanh, hoan thanh, toan thang
thanh hang » thanh hoang, thanh thang, tranh hang
thuong dan » huong dan, thuong han, thuong dam
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 nhanh - tinh toan thanh hang thuong dan chan cau~.
• Adding a wildcard symbol may retrieve word variants: hoc hien nhanh - tinh toan thanh hang thuong dan chan cau*.