Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
chieu sach » chinh sach, chiet tach, chieu sang
thanh hang » thanh hoang, thanh thang, tranh hang
hanh hang » hang hang, hanh han, hanh mang
dung cong » dung trong
cau dung » cau duong, cu dung, cau dong
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan

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