Perhaps you should try some spelling variations:
thanh tung » thanh cong
dieu tinh » diep tinh, lieu tinh, dien tinh
dang cong » dung cong
tung cua » trung cua, tuong cua, dung cua
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
so dieu » bo dieu, hoc dieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so dieu tinh - thanh tung cua ((dang cong) or (dung trong)) tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so dieu tinh - thanh tung cua ((dang cong) OR (dung trong)) tan toan cao*.