Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
nhung cong » dung cong, thong cong, hang cong
hien sach » dien sach, kien sach, chieu sach
tuan bang » tuan dang, tuan hoang, thuat bang
trang va » tran van
cong van » cong vang, cong san, song van
van tuan » van quan, van ban, anh tuan

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)) - hanh ((trang va) OR (hang va)) nhung cong van tuan bang~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (thien hach)) - hanh ((trang va) OR (hang va)) nhung cong van tuan bang.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) or (thien hach)) - hanh ((trang va) OR (hang va)) nhung cong van tuan bang".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (thien hach)) - hanh ((trang va) OR (hang va)) nhung cong van tuan bang*.