Perhaps you should try some spelling variations:
trinh chat » tinh chat, trinh luat, trinh han
trinh thuc » trinh tu, trinh thi
thong cong » trong cong, tong cong, thong thong
theo chu » theo chieu, cho chu, chao chu
chu sach » cau sach, thu sach, chieu sach
nhung bo » nhung bi, nhung bai, nhung don
dan han » dan chan, dan than, dan hanh
han tap » han tai, toan tap, nhan tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chu sach - hanh ((trinh chat) or (trinh thuc)) ((nhung bo) or (thong cong)) dan han tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu sach - hanh ((trinh chat) OR (trinh thuc)) ((nhung bo) OR (thong cong)) dan han tap.
• Adding a wildcard symbol may retrieve word variants: theo chu sach - hanh ((trinh chat) or (trinh thuc)) ((nhung bo) or (thong cong)) dan han tap*.