Perhaps you should try some spelling variations:
hanh trang » thanh trung, hanh trinh, minh trang
thieu sach » chieu sach, thien hach, theo sach
nhung cong » dung cong, thong cong, hang cong
hieu cach » hieu cac, chieu sach, hieu ca
cua nhung » va nhung
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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 trang) or (canh tranh)) cua nhung cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu cach)) - ((hanh trang) OR (canh tranh)) cua nhung cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (hieu cach)) - ((hanh trang) or (canh tranh)) cua nhung cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (hieu cach)) - ((hanh trang) or (canh tranh)) cua nhung cong dan toan cao*.