Perhaps you should try some spelling variations:
chat truong » chat trong, chat luong, cac truong
hieu tinh » chieu tinh, lieu tinh, kieu tinh
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
dong toan » dung toan, bong toan, cong toan
cong hoan » cong hoa, dong hoa, cong san
doc hieu » toc thieu, hoc thieu, hoc hien

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu tinh - hanh tinh chat truong ((dong toan) or (cong hoan)) phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - hanh tinh chat truong ((dong toan) OR (cong hoan)) phan tu.
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - hanh tinh chat truong ((dong toan) or (cong hoan)) phan tu*.