Perhaps you should try some spelling variations:
trong chuong » trong thuong, thong chuong, trong chong
hien nhanh » hien hanh, thien thanh, tien thanh
thanh tung » thanh cong
chuong dan » huong dan, chuong han, chuong dong
hien xanh » hien hanh, chieu xanh, hien khanh
va trong » va truong, va thong, va tuong
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap
tung va » trung va, tuong va, dung va

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) or (hien nhanh)) - thanh tung va trong chuong dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien nhanh)) - thanh tung va trong chuong dan than tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien nhanh)) - thanh tung va trong chuong dan than tap*.