Perhaps you should try some spelling variations:
phuong thao » phuong phap, phuong thuc
hanh trang » thanh trung, canh tranh, hanh trinh
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh mang » nhanh mang, nhanh lang, thanh hang
ho chieu » theo chieu, hoc thieu, doi chieu
va bang » va nang, va lang, va ban
san cau » ban cau, can cau, ran cau
van cau » van dau, van hau, van chat

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: ho chieu xanh - ((hanh mang) OR (hanh trang)) va bang phuong thao ((san cau) OR (van cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu xanh - ((hanh mang) OR (hanh trang)) va bang phuong thao ((san cau) or (van cau))~".
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - ((hanh mang) OR (hanh trang)) va bang phuong thao ((san cau) or (van cau))*.