Perhaps you should try some spelling variations:
thien hach » thien thanh
thanh cung » thanh cuong, thanh cong, thanh tung
hoac khong » hoa khong, hoc khong, hay khong
khong cang » thong cong, hong bang, khong dung
hien hanh » dieu hanh
cung hoac » cong hoa, dung hoc, ung hoa
cang tan » cong tan, cung tan, tang tan
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap

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 hach) OR (hien hanh)) - thanh cung hoac khong cang tan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien hach) OR (hien hanh)) - thanh cung hoac khong cang tan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien hach) OR (hien hanh)) - thanh cung hoac khong cang tan toan cao*.