Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
cong thanh » dong thanh, cong trinh, cong tan
thanh than » thanh thanh, thanh thang, thanh toan
hien bach » vien bach, hien hanh, dien sach
trung cua » truong cua, trung tuan, trung cap
dang cong » dung cong
mang cua » manh cua, dung cua, ban cua
than cap » khan cap, thanh lap, thanh cac

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 bach) OR (thien hach)) - hanh ((trung cua) OR (mang cua)) dang cong thanh than cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien bach) OR (thien hach)) - hanh ((trung cua) or (mang cua)) dang cong thanh than cap~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien bach) OR (thien hach)) - hanh ((trung cua) or (mang cua)) dang cong thanh than cap*.