Perhaps you should try some spelling variations:
phuong thao » phuong phap, phuong thuc
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh tang » hanh trang, anh tang, hanh mang
ho chieu » theo chieu, hoc thieu, doi chieu
van dung » van dong, xay dung, tin dung
va dung » va duong, vat dung, va ung
san cau » van cau, can cau, ran cau
ban cau » bang cau, ban can, van cau

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