Perhaps you should try some spelling variations:
hanh trinh » canh tranh
thuat dang » thuat dung, thuat bang, thuat dan
hien sach » dien sach, kien sach, thien hach
dang cong » dung cong
van khang » van khanh, van thanh, van quang
khang cac » hang cac, khoang cach, khang chan
cong van » cong vang, cong san, song van

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 - ((hanh trinh) or (hanh chinh)) thuat dang cong van khang cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - ((hanh trinh) OR (hanh chinh)) thuat dang cong van khang cac.
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - ((hanh trinh) or (hanh chinh)) thuat dang cong van khang cac*.