Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu xanh » chieu sach, chieu sang, chieu tinh
phat phap » pham phap, phan phap, phap phat
phan phat » phap phat, van phat, phan phoi
ho chieu » theo chieu, hoc thieu, doi chieu
cong bai » cuong bai, cong hai, cung bai
bai toan » bai tap
toan cau » 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: ho chieu xanh - thanh trung ((phat phap) or (phan phat)) cong bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu xanh - thanh trung ((phat phap) OR (phan phat)) cong bai toan cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - thanh trung ((phat phap) or (phan phat)) cong bai toan cau*.