Perhaps you should try some spelling variations:
tranh nghi » thanh nghi, thanh nghia, trinh nghe
sach tranh » canh tranh
xa nghiem » xet nghiem, van nghiem, va nghien
nghi thuc » nghe thuc
thuc hoc » phuc hoc, thu hoc, thuc uoc
su sach » so sach, vu sach
sach xa » sach dao, sach nha, sach bai

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 xa nghiem ngu hoc ) or ( su sach tranh nghi thuc hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach xa nghiem ngu hoc ) OR ( su sach tranh nghi thuc hoc )).
• Adding a wildcard symbol may retrieve word variants: (( su sach xa nghiem ngu hoc ) or ( su sach tranh nghi thuc hoc ))*.