Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach
thuat tach » thuat sach, thuat mach, thuat tac
dung cong » dung trong
trung va » truong va, trung ha, trung tam
trang va » tran van, hang va
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
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 ((thiet tach) OR (thuat tach)) - thanh ((trung va) or (trang va)) dung cong dan chan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuyet ((thiet tach) OR (thuat tach)) - thanh ((trung va) OR (trang va)) dung cong dan chan cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuyet ((thiet tach) OR (thuat tach)) - thanh ((trung va) or (trang va)) dung cong dan chan cap".
• Adding a wildcard symbol may retrieve word variants: thuyet ((thiet tach) OR (thuat tach)) - thanh ((trung va) or (trang va)) dung cong dan chan cap*.