Perhaps you should try some spelling variations:
trinh nghiep » trinh nghien, trinh nghe, trinh ghep
trach nhiem » trac nghiem
dan trinh » dan tinh, van trinh, hanh trinh
nghiep vu » nghiep va
dat trach » sat trach, dat thanh, dat khach
nhiem du » hiem du, nghiem dau, nhiem huu
tu dan » tuc dan, tu ban, cu dan
vu hoc » tu hoc, va hoc, vi hoc
tu dat » tu bat
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: (( tu dan trinh nghiep vu hoc ) or ( tu dat trach nhiem du hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu dan trinh nghiep vu hoc ) OR ( tu dat trach nhiem du hoc ))*.