Perhaps you should try some spelling variations:
nghiem ye » nghiem de, nghiem te, nghiem ve
xa nghiem » xet nghiem, van nghiem, va nghien
sach tam » sach tham, sach tai, sach dao
thi xuan » thi xa
te sach » toc sach
thi lan » thi hanh, thi nang, thi lien
sach xa » sach dao, sach nha, sach bai
ye hoc » y hoc, te 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: (( te sach tam ((thi xuan) OR (thi lan)) hoc ) or ( te sach xa nghiem ye hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tam ((thi xuan) OR (thi lan)) hoc ) OR ( te sach xa nghiem ye hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( te sach tam ((thi xuan) OR (thi lan)) hoc ) or ( te sach xa nghiem ye hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( te sach tam ((thi xuan) OR (thi lan)) hoc ) or ( te sach xa nghiem ye hoc ))*.