Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thanh tuong » thanh thuong, thanh tung, thanh huong
hien nhanh » hien hanh, tien thanh, dien thanh
dung duong » dung dong, dong duong, dung dung
tuong cua » truong cua, huong cua, thong cua
van thang » van thanh, van khang, van hang
cua dung » cua dang, cua dong, qua dung
van than » van thanh, van tuan, van phan

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 nhanh) or (thien thanh)) - thanh tuong cua dung duong ((van than) OR (van thang)) cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien nhanh) OR (thien thanh)) - thanh tuong cua dung duong ((van than) OR (van thang)) cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien nhanh) or (thien thanh)) - thanh tuong cua dung duong ((van than) OR (van thang)) cap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) or (thien thanh)) - thanh tuong cua dung duong ((van than) OR (van thang)) cap*.