Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
tranh nghiem » trac nghiem, trach nhiem, trai nghiem
khao nghiem » khao nghiep
thuoc sach » hoc sach, nuoc sach, thuat sach
lanh khao » lanh dao, lanh tho, lanh hai
nghiem de » nghiem d, nghiem do, nghiem te
te lanh » te danh, te lan, tu lanh
de hoc » te hoc, du hoc, dien hoc
tu hoc » te 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 lanh khao nghiem de hoc ) or ( thuoc sach ((tranh nghiem) OR (trinh nghien)) tu hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te lanh khao nghiem de hoc ) OR ( thuoc sach ((tranh nghiem) OR (trinh nghien)) tu hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( te lanh khao nghiem de hoc ) or ( thuoc sach ((tranh nghiem) OR (trinh nghien)) tu hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( te lanh khao nghiem de hoc ) or ( thuoc sach ((tranh nghiem) OR (trinh nghien)) tu hoc ))*.