Perhaps you should try some spelling variations:
sach tranh » canh tranh
sach tran » sach tren, vach tran, sach tham
tran cong » tran hong, trien cong, tran hoang
tranh my » trinh my, tran sy, anh my
cong khi » cong thai, khong khi, co khi
vu sach » vu bach, vu khach
su sach » so sach
my khi » ly khi, ky khi, my chi

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