Perhaps you should try some spelling variations:
hien nhanh » thien thanh, tien thanh, dien thanh
thong cong » trong cong, tong cong, thong thong
hien hanh » dieu hanh
trang cua » tang cua, trung cua, thang cua
tranh cua » doanh cua, manh cua
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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) or (hien hanh)) - hanh ((trang cua) OR (tranh cua)) thong cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien nhanh) OR (hien hanh)) - hanh ((trang cua) OR (tranh cua)) thong cong tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien nhanh) or (hien hanh)) - hanh ((trang cua) OR (tranh cua)) thong cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) or (hien hanh)) - hanh ((trang cua) OR (tranh cua)) thong cong tac toan cau*.