Perhaps you should try some spelling variations:
sach tranh » canh tranh
tranh duoc » tranh cuoc, trinh duoc, tran duc
tranh hoa » trinh hoa, tranh ha, thanh hoai
thanh hoa » thanh pho
duoc khi » buoc khoi, cuoc khoi, duoc kham
hoc sach » hoc sinh, hoc cac, hoc anh
su sach » so sach, vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach tranh duoc khi đong luc ) or ( hoc sach ((tranh hoa) OR (thanh hoa)) phi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tranh duoc khi đong luc ) OR ( hoc sach ((tranh hoa) OR (thanh hoa)) phi đong luc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su sach tranh duoc khi đong luc ) or ( hoc sach ((tranh hoa) OR (thanh hoa)) phi đong luc ))".
• Adding a wildcard symbol may retrieve word variants: (( su sach tranh duoc khi đong luc ) or ( hoc sach ((tranh hoa) OR (thanh hoa)) phi đong luc ))*.