Perhaps you should try some spelling variations:
sach trinh » sach tranh, hanh trinh, sach kinh
trinh hoa » trinh han
trinh do » trinh ky
toc sach » hoc sach, doc sach, thuoc sach
tu sach » thu sach, su sach, te sach
hoa khi » hoa phi, hoa hi, hoa thi
do khi » doi khi, do thi, co khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach trinh do khi đong luc ) or ( toc sach trinh hoa khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach trinh do khi đong luc ) OR ( toc sach trinh hoa khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach trinh do khi đong luc ) or ( toc sach trinh hoa khi đong luc ))*.