Perhaps you should try some spelling variations:
tham nghiem » trac nghiem, thi nghiem, thu nghiem
thuc nghiem » trac nghiem
thuoc sach » hoc sach, nuoc sach, thuat sach
thuoc nhom » thuoc ho
xa nghiem » xet nghiem, van nghiem, va nghien
nghiem te » nghiem de, nghiem ve, nghiem tien
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 te hoc ) or ( thuoc sach ((tham nghiem) OR (thuc nghiem)) thuoc nhom ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach xa nghiem te hoc ) OR ( thuoc sach ((tham nghiem) OR (thuc nghiem)) thuoc nhom )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su sach xa nghiem te hoc ) or ( thuoc sach ((tham nghiem) OR (thuc nghiem)) thuoc nhom ))".
• Adding a wildcard symbol may retrieve word variants: (( su sach xa nghiem te hoc ) or ( thuoc sach ((tham nghiem) OR (thuc nghiem)) thuoc nhom ))*.