Perhaps you should try some spelling variations:
trong thanh » truong thanh, rong thanh, thong thanh
trung thanh » truong thanh
thien danh » thien anh, thien thanh, thien chanh
thien dang » thien bang, thien nang, thien cong
tranh vat » trinh vat, tranh va, tranh van
vat dung » van dung, va dung, viet dung
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: hoc ((thien danh) or (thien dang)) - canh tranh vat dung ((trong thanh) OR (trung thanh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien danh) OR (thien dang)) - canh tranh vat dung ((trong thanh) OR (trung thanh)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien danh) or (thien dang)) - canh tranh vat dung ((trong thanh) OR (trung thanh)) toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien danh) or (thien dang)) - canh tranh vat dung ((trong thanh) OR (trung thanh)) toan tap*.