Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
manh khung » manh hung, manh tung, anh hung
thang long » thanh cong
hien sach » dien sach, kien sach, chieu sach
khung cua » chung cua, khung luan, chung cu
hang cong » dang cong, hang nong, bang cong
dan toan » van toan, dan than, manh toan
toan tap » toan ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien sach) OR (thien hach)) - manh khung cua ((hang cong) or (thang long)) dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (thien hach)) - manh khung cua ((hang cong) OR (thang long)) dan toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) OR (thien hach)) - manh khung cua ((hang cong) or (thang long)) dan toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) OR (thien hach)) - manh khung cua ((hang cong) or (thang long)) dan toan tap*.