Perhaps you should try some spelling variations:
sach tranh » canh tranh
cong thanh » dong thanh, cong trinh, cong tan
cac nganh » hoc nganh
sach tran » sach tren, vach tran, sach tham
tran cong » tran hong, trien cong, tran hoang
cong khi » cong thai, khong khi, co khi
te sach » toc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te ((sach tranh) or (cac nganh)) cong khi đong luc ) or ( te sach tran cong thanh đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te ((sach tranh) OR (cac nganh)) cong khi đong luc ) OR ( te sach tran cong thanh đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( te ((sach tranh) or (cac nganh)) cong khi đong luc ) or ( te sach tran cong thanh đong luc ))*.