Perhaps you should try some spelling variations:
thanh tung » thanh cong
hien hach » thien hach, hien hanh, hien nhanh
cua nhung » va nhung
phong van » phung van, thong van, hong van
tung cua » trung cua, tuong cua, dung cua
phong va » thong va, phung van, thong van
than cau » toan cau, phan cau, than cap

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 hach - thanh tung cua nhung ((phong van) or (phong va)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien hach - thanh tung cua nhung ((phong van) OR (phong va)) than cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien hach - thanh tung cua nhung ((phong van) or (phong va)) than cau*.