Perhaps you should try some spelling variations:
hanh trinh » canh tranh
kinh nghe » tinh nghe, vinh nghe, kinh nghiem
trinh te » trinh tu, trinh he, trinh ke
chinh te » chinh ta, chinh ke, chinh tu
tu sach » thu sach, su sach, te sach
nghe di » nghe vi, nghe dien, nghe dan
tu hanh » lu hanh, thuc hanh, thi hanh
dau hoc » dai hoc, du hoc, dan hoc
du hanh » dieu hanh, duy khanh, luu hanh
duy hoc » du hoc, day hoc, duc hoc
di hoc » dai hoc, dia hoc, li hoc
te dau » te du, ty dau, ke dau
te duy » tu duy, te du, le duy

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