Perhaps you should try some spelling variations:
chiet tach » chieu sach
dong manh » duong manh, dong anh, dang manh
manh toan » thanh toan, anh tuan, tinh toan
anh tang » anh bang, anh dang, anh nang
tang cua » mang cua, hang cua, tang luan
toan cao » toan ban, toan tap
tinh » dinh, minh, kinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((trieu (tinh OR trinh)) or (chiet tach)) - anh tang cua cong dong manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((trieu (tinh OR trinh)) OR (chiet tach)) - anh tang cua cong dong manh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((trieu (tinh OR trinh)) or (chiet tach)) - anh tang cua cong dong manh toan cao".
• Adding a wildcard symbol may retrieve word variants: theo ((trieu (tinh OR trinh)) or (chiet tach)) - anh tang cua cong dong manh toan cao*.