Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
chieu sach » chinh sach, chiet tach, chieu sang
hanh hang » thanh hang, hanh han, hanh mang
hang hang » nang hang, cang thang, hung thang
dung cong » dung trong
hai dung » hai duong, mai dung, hai dang
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan cau » phan dau, phan cac, phan tu

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 (chieu sach)) - ((hanh hang) OR (hang hang)) hai dung cong tan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien hach) OR (chieu sach)) - ((hanh hang) OR (hang hang)) hai dung cong tan phan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien hach) or (chieu sach)) - ((hanh hang) OR (hang hang)) hai dung cong tan phan cau*".