Perhaps you should try some spelling variations:
trien hoat » tien hoa
sach tranh » canh tranh
tranh hoa » thanh hoa, trinh hoa, tranh ha
hoat khi » thoat khoi, hoat doi, suat khi
toc sach » hoc sach, doc sach, thuoc sach
su sach » vu sach
so sach » so sanh, bo sach, co sach
hoa thi » hoa thai, ha thi, hoa phi

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) OR (so sach)) trien hoat khi đong luc ) or ( toc sach tranh hoa thi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((su sach) OR (so sach)) trien hoat khi đong luc ) OR ( toc sach tranh hoa thi đong luc ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((su sach) OR (so sach)) trien hoat khi đong luc ) or ( toc sach tranh hoa thi đong luc ))*".