Perhaps you should try some spelling variations:
thanh tung » thanh cong
chuong dan » huong dan, chuong han, chuong dong
hien xanh » hien hanh, hien nhanh, chieu xanh
va trung » ba trung, ha trung, va thuong
va tuong » va thuong, va thong, xa truong
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan 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 xanh - thanh tung ((va trung) or (va tuong)) chuong dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - thanh tung ((va trung) OR (va tuong)) chuong dan than tap.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - thanh tung ((va trung) or (va tuong)) chuong dan than tap*.