Perhaps you should try some spelling variations:
nhung phong » nhung phuong, nhung chong, nung phong
hien manh » tien manh, hieu manh, hien nhanh
hien hanh » dieu hanh
chinh sua » chinh su, chinh cua, chinh luan
phong van » phung van, thong van, phong va
hinh cua » chinh cua, sinh cua, tinh cua
van toan » van tuan, van tan, van thanh
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 manh) OR (hien hanh)) - hanh ((chinh sua) or (hinh cua)) nhung phong van toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien manh) OR (hien hanh)) - hanh ((chinh sua) OR (hinh cua)) nhung phong van toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien manh) OR (hien hanh)) - hanh ((chinh sua) or (hinh cua)) nhung phong van toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien manh) OR (hien hanh)) - hanh ((chinh sua) or (hinh cua)) nhung phong van toan cau*.