Perhaps you should try some spelling variations:
sach tranh » canh tranh
thu sach » thuat sach, thuoc sach, thu hoach
tranh my » trinh my, tran sy, anh my
tu sach » su sach, te sach, tu cach
so sach » so sanh, bo sach, co sach
tranh y » trinh y, tranh o, tranh 30
my khi » ly khi, ky khi, my chi
y khi » ly khi, ky khi, y chi

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