Perhaps you should try some spelling variations:
tieu hanh » dieu hanh, tiem hanh, tien hanh
dung cong » dung trong
thang va » hang va, thong va, thanh va
trang va » tran van, hang va
cong van » cong vang, cong san, song van
van luan » van quan, van tuan, von luan
luan ban » luan van, luan san, luan han

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu hanh - hanh ((thang va) or (trang va)) dung cong van luan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu hanh - hanh ((thang va) OR (trang va)) dung cong van luan ban.
• Adding a wildcard symbol may retrieve word variants: theo tieu hanh - hanh ((thang va) or (trang va)) dung cong van luan ban*.