Perhaps you should try some spelling variations:
trach nhiem » trac nghiem
nhiem thuoc » nghiem thuoc, nhiem thuc, nhiem thuong
thuoc hoc » thuoc ho, thuoc nhom, thuong hoc
tac nhiem » trac nghiem, tac nghiep, thai nhiem
canh tac » canh tay, canh giac, cong tac
nhiem du » hiem du, nghiem dau, nhiem huu
tu canh » thu canh, tu chanh, tu can
te sat » te dat, te san
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: (( te sat trach nhiem thuoc hoc ) or ( tu canh tac nhiem du hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sat trach nhiem thuoc hoc ) OR ( tu canh tac nhiem du hoc )).
• Adding a wildcard symbol may retrieve word variants: (( te sat trach nhiem thuoc hoc ) or ( tu canh tac nhiem du hoc ))*.