Perhaps you should try some spelling variations:
sach tranh » canh tranh
doanh khoa » toan khoa
dau doanh » dao doanh, van doanh, vay doanh
khoa kham » kho khan, khoa than
tranh co » trinh co, tranh o, tranh cuoc
thau dau » phan dau, chau au
vu sach » vu bach, su sach, vu khach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( vu sach tranh co khi đong luc ) or ( thau dau doanh khoa kham đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( vu sach tranh co khi đong luc ) OR ( thau dau doanh khoa kham đong luc ))*.