Perhaps you should try some spelling variations:
sach trinh » sach tranh, hanh trinh, sach kinh
trinh quan » tinh quang, trinh luat, trinh han
vach tran » sach tranh, hach toan, sach tren
tran cong » tran hong, trien cong, tran hoang
quan khi » quan khu, quan chi, quang khai
cong khi » cong thai, khong khi, co khi
tu sach » thu sach, su sach, te sach
vu vach » vu bach, vu sach, vu khach

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