Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, hieu manh
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh trung » thanh trung, hanh trang, manh trung
trong thpt » truong thpt, trong thuat, trong thiet
hieu xanh » hieu manh, hieu nganh, dieu hanh
trung cap » truong cao, trung tam
thpt toan » thpt tran, thuat toan, thpt thang
cap dung » ap dung, cao dung, chan dung
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: doc ((hieu xanh) or (((chieu xanh) OR (chieu tinh)))) - hanh trung cap dung trong thpt toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (((chieu xanh) OR (chieu tinh)))) - hanh trung cap dung trong thpt toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) or (((chieu xanh) OR (chieu tinh)))) - hanh trung cap dung trong thpt toan cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (((chieu xanh) OR (chieu tinh)))) - hanh trung cap dung trong thpt toan cau*.