Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
trung hoa » trung hoc, trung ha
cot lieu » co lieu, vat lieu, so lieu
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap
so kieu » so dieu, so lieu, ho kieu
tung he » dung he, tung ho, tang he

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((cot lieu) or (so kieu)) tinh - thanh ((tung he) or (trung hoa)) thong cong dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((cot lieu) OR (so kieu)) tinh - thanh ((tung he) OR (trung hoa)) thong cong dan than cao.
• Adding a wildcard symbol may retrieve word variants: ((cot lieu) or (so kieu)) tinh - thanh ((tung he) or (trung hoa)) thong cong dan than cao*.