Perhaps you should try some spelling variations:
thanh trung » thanh tung
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 hoa » trung hoc, trung ha
hoa nhung » hoc nhung, hon nhung, va nhung
cong tac » cong ty
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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 hoa nhung cong tac ((toan cau) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu tinh) OR (hieu quang)) - thanh trung hoa nhung cong tac ((toan cau) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu tinh) or (hieu quang)) - thanh trung hoa nhung cong tac ((toan cau) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu tinh) or (hieu quang)) - thanh trung hoa nhung cong tac ((toan cau) OR (toan tap))*.