Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thanh tung » thanh cong
hien danh » thien danh, hien hanh, hien nhanh
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
toan tap » toan ban
tung va » trung va, tuong va, dung va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien danh) or (thien thanh)) - thanh tung va ((hang cong) OR (dang cong)) tinh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien danh) OR (thien thanh)) - thanh tung va ((hang cong) OR (dang cong)) tinh toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien danh) or (thien thanh)) - thanh tung va ((hang cong) OR (dang cong)) tinh toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien danh) or (thien thanh)) - thanh tung va ((hang cong) OR (dang cong)) tinh toan tap*.