Perhaps you should try some spelling variations:
sach trinh » hanh trinh, sach kinh, sach tren
sach tranh » canh tranh
tranh cong » thanh cong, trinh cong, tran cong
trinh my » trinh may, trinh ky, trinh ly
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 trinh my khi đong luc ) or ( su sach tranh cong khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( vu sach trinh my khi đong luc ) OR ( su sach tranh cong khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( vu sach trinh my khi đong luc ) or ( su sach tranh cong khi đong luc ))*.