Perhaps you should try some spelling variations:
hanh hang » thanh hang, hang hang, hanh mang
luan danh » luan thanh, luan van, luan nang
danh cong » dang cong, hanh cong, anh cong
theo cau » theo chu, theo cap, theo dau
cau sach » cao sach, hau sach, rau sach
hanh han » hanh nhan, hanh phan, hanh san
dan toan » van toan, dan than, manh toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo cau sach - ((hanh hang) OR (hanh han)) luan danh cong ((dan toan) or (anh tuan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo cau sach - ((hanh hang) OR (hanh han)) luan danh cong ((dan toan) OR (anh tuan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo cau sach - ((hanh hang) OR (hanh han)) luan danh cong ((dan toan) or (anh tuan)) tap".
• Adding a wildcard symbol may retrieve word variants: theo cau sach - ((hanh hang) OR (hanh han)) luan danh cong ((dan toan) or (anh tuan)) tap*.