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, hang hang, hanh han
hang cau » hang dau, hang ca, nhung cau
cau dong » cau duong, cau cong, cao dong
cong van » cong vang, song van, cong tan
cong san » cong tac
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 cau dong ((cong van) OR (cong san)) phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien hach) OR (chieu sach)) - hanh hang cau dong ((cong van) OR (cong san)) phan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien hach) or (chieu sach)) - hanh hang cau dong ((cong van) OR (cong san)) phan cau*".