Perhaps you should try some spelling variations:
sach tranh » canh tranh
thu nghiem » thuc nghiem, thi nghiem
sach trai » sach tai, khach trai, sach tham
nghiem mo » nghiem mon, nghiem moi, nghiem ma
sanh thu » sach thu, san thu, doanh thu
nghiem y » nghiep y, nghiem _, nghiem d
so sanh » do sanh
mo hoc » mon hoc, co hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sanh thu nghiem y hoc ) or ( tu ((sach trai) or (sach tranh)) nghiem mo hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh thu nghiem y hoc ) OR ( tu ((sach trai) OR (sach tranh)) nghiem mo hoc )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh thu nghiem y hoc ) or ( tu ((sach trai) or (sach tranh)) nghiem mo hoc ))*.