Perhaps you should try some spelling variations:
thi nghiep » khoi nghiep, thai nghien, xi nghiep
thi nghiem » thuc nghiem
nghiem du » nghiem dau, nghiem d, nghiem de
cua thuoc » cay thuoc, cua nuoc, cua quoc
nha thuoc » nha nuoc, nhan thuc, nha hoc
sach thi » sach thu, sach tai, sach thieu
vu quach » vu quang, vu bach, vu khach
su sach » so sach, vu sach
du hoc » tu hoc, duoc hoc

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 thi nghiem du hoc ) or ( vu quach thi nghiep ((cua thuoc) OR (nha thuoc)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach thi nghiem du hoc ) OR ( vu quach thi nghiep ((cua thuoc) OR (nha thuoc)) ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su sach thi nghiem du hoc ) or ( vu quach thi nghiep ((cua thuoc) OR (nha thuoc)) ))*".