Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
thieu sach » chieu sach, thien hach, theo sach
cong thanh » dong thanh, cong trinh, cong tan
hieu cach » hieu cac, chieu sach, hieu ca
tranh cua » doanh cua, manh cua
cua nhung » va nhung
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 ((thieu sach) or (hieu cach)) - hanh tranh cua nhung ((huong dan) or (cong thanh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu cach)) - hanh tranh cua nhung ((huong dan) OR (cong thanh)) toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (hieu cach)) - hanh tranh cua nhung ((huong dan) or (cong thanh)) toan tap*.