Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
chieu sach » chinh sach, chiet tach, chieu sang
hanh nhan » thanh nhan, danh nhan, anh nhan
dong cong » duong cong, dung cong, dang cong
hanh han » hanh phan, hanh san, anh han
tai dong » thai dong, tai cong, tai tong
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan
phan dau » phan tu, hang dau

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 ((thien hach) OR (chieu sach)) - ((hanh han) OR (hanh nhan)) tai dong cong dan phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien hach) or (chieu sach)) - ((hanh han) OR (hanh nhan)) tai dong cong dan phan dau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien hach) or (chieu sach)) - ((hanh han) OR (hanh nhan)) tai dong cong dan phan dau*.