Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
thanh tran » thanh trang, thanh toan, thanh tra
thong cong » trong cong, tong cong, thong thong
tran tuan » tran xuan, tran quang, tran thanh
dang cong » dung cong
trinh van » trinh han, trinh quan, trinh toan
van cau » van dau, van hau, van chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu sach - thanh tran tuan ((thong cong) or (dang cong)) trinh van cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sach - thanh tran tuan ((thong cong) OR (dang cong)) trinh van cau.
• Adding a wildcard symbol may retrieve word variants: toc thieu sach - thanh tran tuan ((thong cong) or (dang cong)) trinh van cau*.