Perhaps you should try some spelling variations:
sach trinh » sach tranh, hanh trinh, sach kinh
sach tren » sach tien, sach tranh
chinh chi » chinh cho, chinh che, chinh thi
chi duoc » che duoc, cho duoc, chet duoc
duoc hoc » quoc hoi
nghe di » nghe vi, nghe dien, nghe dan
du hanh » dieu hanh, duy khanh, luu hanh
di hoc » dai hoc, dia hoc, li hoc

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 trinh) or (sach tren)) nghe di hoc ) or ( du hanh chinh chi duoc hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te ((sach trinh) OR (sach tren)) nghe di hoc ) OR ( du hanh chinh chi duoc hoc )).
• Adding a wildcard symbol may retrieve word variants: (( te ((sach trinh) or (sach tren)) nghe di hoc ) or ( du hanh chinh chi duoc hoc ))*.