Perhaps you should try some spelling variations:
thi nghiem » thuc nghiem
nhung cong » dung cong, thong cong, hang cong
cong thanh » dong thanh, cong trinh, cong tan
thanh toan » thanh hoa, thanh san, tinh toan
khai niem » hai diem
trang va » tran van
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((khai niem) or (thi nghiem)) trong - hanh ((trang va) OR (hang va)) nhung cong thanh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((khai niem) OR (thi nghiem)) trong - hanh ((trang va) OR (hang va)) nhung cong thanh toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((khai niem) or (thi nghiem)) trong - hanh ((trang va) OR (hang va)) nhung cong thanh toan tap".
• Adding a wildcard symbol may retrieve word variants: ((khai niem) or (thi nghiem)) trong - hanh ((trang va) OR (hang va)) nhung cong thanh toan tap*.