Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
thien hach » thien thanh, hien hanh
thanh chau » thanh cha, thanh cham, thanh chu
hien sach » dien sach, kien sach, chieu sach
doanh va » doan va, doanh tai, doanh cua
cong van » cong vang, song van, cong tan
cong san » cong tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien sach) or (thien hach)) - doanh doanh va nhung ((cong van) OR (cong san)) thanh chau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (thien hach)) - doanh doanh va nhung ((cong van) OR (cong san)) thanh chau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) or (thien hach)) - doanh doanh va nhung ((cong van) OR (cong san)) thanh chau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (thien hach)) - doanh doanh va nhung ((cong van) OR (cong san)) thanh chau*.