Perhaps you should try some spelling variations:
thieu tach » chiet tach, chieu sach, hieu cach
thien hach » thien thanh, hien hanh
hanh trang » thanh trung, canh tranh, hanh trinh
trang cua » tranh cua, tang cua, trung cua
trong dan » trong dang, trong tan, trong ban
trong san » trong cac, cong san, dong san
cua dang » cua cong, cua ban
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu tach) or (thien hach)) - hanh trang cua dang ((trong dan) OR (trong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu tach) OR (thien hach)) - hanh trang cua dang ((trong dan) OR (trong san)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu tach) or (thien hach)) - hanh trang cua dang ((trong dan) OR (trong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu tach) or (thien hach)) - hanh trang cua dang ((trong dan) OR (trong san)) toan cao*.