Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, hang cong
hoc chieu » hoc thieu, ho chieu, hoc hien
trang va » tran van, hang va
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (((doi chi) OR (doi khi)))) xanh - hanh trang va nhung cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) or (((doi chi) OR (doi khi)))) xanh - hanh trang va nhung cong tac toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) or (((doi chi) OR (doi khi)))) xanh - hanh trang va nhung cong tac toan cau*.