Perhaps you should try some spelling variations:
thanh thang » nhanh thang, thanh thanh, thanh hang
hieu cach » hieu cac, chieu sach, hieu ca
thang van » tang van, thanh van, thong van
dang cong » dung cong
hoc hieu » hoc thieu, hoc hien, doc hieu
van dang » van dong, van dung, van nang
van than » van thanh, van thang, van phan
van tuan » van quan, van ban, anh tuan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - thanh thang van dang cong ((van than) OR (van tuan)) cau~.
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - thanh thang van dang cong ((van than) or (van tuan)) cau*.