Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, kieu tinh
hanh trung » thanh trung, hanh trang, manh trung
chau tinh » cuu tinh, ha tinh, cua tinh
trung tin » trung tinh, trong tin, trang tin
trong bai » trong ban, thong bai, trong hai
bai toan » bai tap
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: theo ((chieu tinh) or (chau tinh)) - hanh trung tin dung trong bai toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu tinh) OR (chau tinh)) - hanh trung tin dung trong bai toan cao.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu tinh) or (chau tinh)) - hanh trung tin dung trong bai toan cao*.