Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hien hach » thien hach, hien hanh, hien nhanh
trinh cua » trinh luat, trinh quan, trinh luan
tinh cua » tinh chat, tranh cua, tinh thua
sinh cua » manh cua, dinh cuu, sinh va
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien hach - hanh ((trinh cua) OR (((tinh cua) OR (sinh cua)))) thong cong dan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien hach - hanh ((trinh cua) or (((tinh cua) OR (sinh cua)))) thong cong dan toan cao~".
• Adding a wildcard symbol may retrieve word variants: hoc hien hach - hanh ((trinh cua) or (((tinh cua) OR (sinh cua)))) thong cong dan toan cao*.