Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
dang cong » dung cong
nhan tai » van tai, toan tai
hang tai » hang va, dung tai
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
nhan va » nhan dan, nhan tao, phan van

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 ((nhan va) or (((nhan tai) OR (hang tai)))) dang cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - hanh ((nhan va) OR (((nhan tai) OR (hang tai)))) dang cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - hanh ((nhan va) or (((nhan tai) OR (hang tai)))) dang cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh ((nhan va) or (((nhan tai) OR (hang tai)))) dang cong dan toan cao*.