Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
cong thanh » dong thanh, cong trinh, cong tan
thanh chan » thanh phan, thanh nhan, thanh cha
hoc thieu » toc thieu
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
chan tu » phan tu, han tu, chon tu

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) or (hoc hien)) xanh - thanh ((trung cua) OR (trung cap)) nhung cong thanh chan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (hoc hien)) xanh - thanh ((trung cua) OR (trung cap)) nhung cong thanh chan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (hoc hien)) xanh - thanh ((trung cua) OR (trung cap)) nhung cong thanh chan tu".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (hoc hien)) xanh - thanh ((trung cua) OR (trung cap)) nhung cong thanh chan tu*.