Perhaps you should try some spelling variations:
sach tranh » canh tranh
nghiem cua » nghiep cua, nhiem cua, nghiem xuan
thi nghiem » thuc nghiem
sach trai » sach tai, khach trai, sach tham
cua thuoc » nha thuoc, cay thuoc, cua nuoc
nghiem va » nghiep va, nghiep vua, nghiep vu
sach thi » sach thu, sach tai, sach thieu
tu sach » thu sach, su sach, te sach
va hoc » van hoc

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 trai) OR (sach tranh)) nghiem cua thuoc ) or ( tu sach thi nghiem va hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu ((sach trai) OR (sach tranh)) nghiem cua thuoc ) OR ( tu sach thi nghiem va hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu ((sach trai) OR (sach tranh)) nghiem cua thuoc ) or ( tu sach thi nghiem va hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( tu ((sach trai) OR (sach tranh)) nghiem cua thuoc ) or ( tu sach thi nghiem va hoc ))*.