Perhaps you should try some spelling variations:
sach tranh » canh tranh
tranh hoc » thanh hoc, tranh cuoc, tranh duoc
tranh hoa » thanh hoa, trinh hoa, thanh hoai
tranh ha » thanh ha, trang ha, trinh ha
te sach » toc sach
hoc khi » hoc khoi, hoc khia, hoc ki
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: (( te sach tranh hoc khi đong luc ) or ( su sach ((tranh hoa) OR (tranh ha)) phi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tranh hoc khi đong luc ) OR ( su sach ((tranh hoa) OR (tranh ha)) phi đong luc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( te sach tranh hoc khi đong luc ) or ( su sach ((tranh hoa) OR (tranh ha)) phi đong luc ))".
• Adding a wildcard symbol may retrieve word variants: (( te sach tranh hoc khi đong luc ) or ( su sach ((tranh hoa) OR (tranh ha)) phi đong luc ))*.