Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
canh trinh » canh tranh, hanh trinh, canh tinh
thien anh » thien danh, tien anh, thien thanh
trinh ve » trinh he, trinh va, trinh vi
ve thong » he thong, va thong, ve phong
dan phan » doan phan, van phan, dam phan
dan chan » dan gian, dan ca, van chat

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 anh) or (trieu tinh)) - canh trinh ve thong cong ((dan phan) OR (dan chan)) dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien anh) OR (trieu tinh)) - canh trinh ve thong cong ((dan phan) OR (dan chan)) dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien anh) or (trieu tinh)) - canh trinh ve thong cong ((dan phan) OR (dan chan)) dau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien anh) or (trieu tinh)) - canh trinh ve thong cong ((dan phan) OR (dan chan)) dau*.