Perhaps you should try some spelling variations:
chua nghien » qua nghien, cham nghien, chi nghien
thue nghien » thuyet nghien, thuc nghiem, thai nghien
thu nghiem » thuc nghiem, thi nghiem
sach thu » sach thue, sach thieu, sach tham
nghiem d » nghiem de, nghiem do, nghiem _
su sach » so sach
vu sach » vu bach, vu khach
cuu hoi » cau hoi, cua hoi, cuu hoc
d hoc » du hoc, ad hoc, de 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 thu nghiem d hoc ) or ( vu sach ((thue nghien) OR (chua nghien)) cuu hoi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach thu nghiem d hoc ) OR ( vu sach ((thue nghien) OR (chua nghien)) cuu hoi ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su sach thu nghiem d hoc ) or ( vu sach ((thue nghien) OR (chua nghien)) cuu hoi ))*".