Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
trien cong » thien cong
vu khach » vu khanh, vu khac, vay khach
tranh my » trinh my, tran sy, anh my
cong khi » cong thai, khong khi, co khi
su sach » so sach, vu 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 bach) or (vu khach)) tranh my khi đong luc ) or ( su sach trien cong khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((vu bach) OR (vu khach)) tranh my khi đong luc ) OR ( su sach trien cong khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( ((vu bach) or (vu khach)) tranh my khi đong luc ) or ( su sach trien cong khi đong luc ))*.