Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
duong manh » duong van
trinh cua » tinh cua, trinh luat, trinh luan
cong manh » cong danh, cong thanh, hoang manh
chao cau » chao chu, chao chao, cao cap
cau sach » cao sach, hau sach, rau sach
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: chao cau sach - hanh ((trinh cua) OR (trinh quan)) thong ((cong manh) or (duong manh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: chao cau sach - hanh ((trinh cua) OR (trinh quan)) thong ((cong manh) OR (duong manh)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "chao cau sach - hanh ((trinh cua) OR (trinh quan)) thong ((cong manh) or (duong manh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: chao cau sach - hanh ((trinh cua) OR (trinh quan)) thong ((cong manh) or (duong manh)) toan cao*.