Perhaps you should try some spelling variations:
thien danh » thien anh, thien dang, thien thanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
dung cong » dung trong
dung cua » dung luan, dung cho
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van 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 ((hieu manh) or (thien danh)) - hanh ((thong quan) or (dung cua)) dung cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (thien danh)) - hanh ((thong quan) OR (dung cua)) dung cong tan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (thien danh)) - hanh ((thong quan) or (dung cua)) dung cong tan toan cau*.