Perhaps you should try some spelling variations:
dong thieu » dong trieu, dong hieu, dong tieu
cong thuoc » cong thuc, dong thuoc, long thuoc
thuoc dung » hoc dung, thuy dung
doi chieu » doc hieu, doi chi, mot chieu
dung cong » dung trong
cong tinh » cong trinh, cong vinh, long tinh
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: ((doi chieu) or (dong thieu)) tinh - thanh cong thuoc dung cong tinh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (dong thieu)) tinh - thanh cong thuoc dung cong tinh toan tap.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (dong thieu)) tinh - thanh cong thuoc dung cong tinh toan tap*.