Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh trung » thanh trung, hanh trang, manh trung
nhung cong » thong cong, hang cong, nhung don
quang toan » quang tuan, quang tran, quang doan
hoc chieu » hoc thieu, ho chieu, hoc hien
dung cong » dung trong
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 chieu tinh - ((hanh trung) or (canh tranh)) va ((nhung cong) OR (dung cong)) quang toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu tinh - ((hanh trung) OR (canh tranh)) va ((nhung cong) OR (dung cong)) quang toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu tinh - ((hanh trung) or (canh tranh)) va ((nhung cong) OR (dung cong)) quang toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc chieu tinh - ((hanh trung) or (canh tranh)) va ((nhung cong) OR (dung cong)) quang toan cao*.