Perhaps you should try some spelling variations:
thien anh » thien danh, thien thanh, thien chanh
dung cong » dung trong
tien anh » tieng anh, tien manh, dien anh
manh cua » doanh cua
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
ban cua » ban quan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien anh) or (tien anh)) - anh ((ban cua) or (manh cua)) dung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien anh) OR (tien anh)) - anh ((ban cua) OR (manh cua)) dung cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien anh) or (tien anh)) - anh ((ban cua) or (manh cua)) dung cong tac toan cau*.