Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
chuong dan » huong dan, chuong dong, phuong danh
chuong han » thuong han, chung han, phuong hanh
tranh cua » doanh cua, manh cua
tang cua » mang cua, hang cua, tang luan
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 - hanh ((tranh cua) or (tang cua)) trong ((chuong dan) OR (chuong han)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien nhanh - hanh ((tranh cua) OR (tang cua)) trong ((chuong dan) OR (chuong han)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien nhanh - hanh ((tranh cua) or (tang cua)) trong ((chuong dan) OR (chuong han)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hien nhanh - hanh ((tranh cua) or (tang cua)) trong ((chuong dan) OR (chuong han)) toan cau*.