Perhaps you should try some spelling variations:
trung tdanh » trung thanh, truong thanh, trung tran
thien hach » thien thanh, hien hanh
trung tuan » trung thanh, trung tam, tran tuan
trung cong » truong cong, trong cong, trung uong
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban
hieu ca » hieu cac, hieu cua, hieu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu ca) or (thien hach)) - danh ((trung tdanh) OR (trung tuan)) trung cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu ca) OR (thien hach)) - danh ((trung tdanh) OR (trung tuan)) trung cong san toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu ca) or (thien hach)) - danh ((trung tdanh) OR (trung tuan)) trung cong san toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu ca) or (thien hach)) - danh ((trung tdanh) OR (trung tuan)) trung cong san toan ban*.