Perhaps you should try some spelling variations:
thuyet thuat » thuyet thiet, thu thuat, thuyet hoa
thuyet thuc » thuyet phuc, thuyet truoc, thuat thuc
dung cong » dung trong
trung va » truong va, trung ha, trung tam
trang va » tran van, hang va
cong san » cong tac
san chan » san chang, dan chan, san chay
chan cap » khan cap, than cap, cao cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuyet thuat) OR (thuyet thuc)) mach - thanh ((trung va) or (trang va)) dung cong san chan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuyet thuat) OR (thuyet thuc)) mach - thanh ((trung va) OR (trang va)) dung cong san chan cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuyet thuat) OR (thuyet thuc)) mach - thanh ((trung va) or (trang va)) dung cong san chan cap".
• Adding a wildcard symbol may retrieve word variants: ((thuyet thuat) OR (thuyet thuc)) mach - thanh ((trung va) or (trang va)) dung cong san chan cap*.