Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
thi thong » thi thuong, thi hong, thi khong
chu manh » ho manh, chu han, thu minh
dung thi » dung tai, dung tri, dung chi
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap
chu van » cuu van, chu han

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chu manh) or (chu van)) - sach dung thi thong cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chu manh) OR (chu van)) - sach dung thi thong cong san toan cao.
• Adding a wildcard symbol may retrieve word variants: theo ((chu manh) or (chu van)) - sach dung thi thong cong san toan cao*.