Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
hanh tung » thanh tung, manh tung, hanh dung
dung cong » dung trong
anh nang » ganh nang, anh bang, anh dang
cua dung » cua dang, cua dong, qua dung
lang ban » lang van, nang ban, lang man
hang ban » hang luan, hang va, hang tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - ((hanh tung) or (anh nang)) cua dung cong ((lang ban) OR (hang ban)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - ((hanh tung) OR (anh nang)) cua dung cong ((lang ban) OR (hang ban)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - ((hanh tung) or (anh nang)) cua dung cong ((lang ban) OR (hang ban)) cau".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - ((hanh tung) or (anh nang)) cua dung cong ((lang ban) OR (hang ban)) cau*.