Perhaps you should try some spelling variations:
thanh trung » thanh tung
thien hach » thien thanh
tong thong » thong thong, dong thong, cong thong
hien hanh » dieu hanh
trung cua » truong cua, trung tuan, trung cap
cua tong » cua cong, cua dong, cua nong
toan can » toan ban, toan cao, toan cau
tan can » tan van, ban can, tac can

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 trung cua tong thong ((tan can) or (toan can)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien hach) OR (hien hanh)) - thanh trung cua tong thong ((tan can) OR (toan can)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien hach) or (hien hanh)) - thanh trung cua tong thong ((tan can) or (toan can)) cau*.