Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thuong cong » thong cong, thuong con, thuong dong
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » 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 thieu quang - thanh ((trung cua) or (trung cap)) thuong cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu quang - thanh ((trung cua) OR (trung cap)) thuong cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu quang - thanh ((trung cua) or (trung cap)) thuong cong tac toan cau*.