Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu tinh » chieu tinh, lieu tinh, kieu tinh
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
doc hieu » toc thieu, hoc thieu, hoc hien
cong sat » cong suat, cong san, cong hat
sat phan » sat nhan, vat phan, xuat phan
phan lap » phan dau

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 tinh - hanh ((trung cua) or (trung cap)) thong cong sat phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - hanh ((trung cua) OR (trung cap)) thong cong sat phan lap*.