Perhaps you should try some spelling variations:
trien cong » thien cong
sach trien » sach tien, sach tren, sach thieu
sach tran » sach tranh, sach tren, vach tran
tran dong » tran hong, tran dang, tran dung
dong khi » duong khi, dong thi, dong chi
thu sach » tu sach, thuat sach, thuoc sach
cong khi » cong thai, khong khi, co khi
su sach » so sach, vu sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach tran dong khi đong luc ) or ( thu sach trien cong khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tran dong khi đong luc ) OR ( thu sach trien cong khi đong luc ))*.