Perhaps you should try some spelling variations:
sach tranh » canh tranh
sach tran » sach tren, vach tran, sach tham
tranh ky » trinh ky, thanh ky, hanh ky
vu sach » vu bach, su sach, vu khach
tran my » tran sy, toan my, tran mi
tu sach » thu sach, su sach, te sach
my khi » ly khi, my chi
ky khi » ky thi, ly khi

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 tran my khi đong luc ) or ( tu sach tranh ky khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( vu sach tran my khi đong luc ) OR ( tu sach tranh ky khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( vu sach tran my khi đong luc ) or ( tu sach tranh ky khi đong luc ))*.