Perhaps you should try some spelling variations:
phuong thao » phuong thuc
hanh trang » thanh trung, canh tranh, hanh trinh
doi chieu » doc hieu, doi chi, mot chieu
ho chieu » theo chieu, hoc thieu, mot chieu
trang va » tran van, hang va
toan cau » toan cao, toan ban, toan tap
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) OR (doi chieu)) xanh - hanh trang va dung ((phuong thao) or (phuong phap)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) xanh - hanh trang va dung ((phuong thao) OR (phuong phap)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (doi chieu)) xanh - hanh trang va dung ((phuong thao) or (phuong phap)) toan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (doi chieu)) xanh - hanh trang va dung ((phuong thao) or (phuong phap)) toan cau*.