Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, hang cong
trung hoc » trung quoc
trung ha » trung tam, trung cap
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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) or (hieu quang)) - thanh ((trung ha) OR (trung hoc)) nhung cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu tinh) OR (hieu quang)) - thanh ((trung ha) OR (trung hoc)) nhung cong tac toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu tinh) or (hieu quang)) - thanh ((trung ha) OR (trung hoc)) nhung cong tac toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu tinh) or (hieu quang)) - thanh ((trung ha) OR (trung hoc)) nhung cong tac toan cao*.