Perhaps you should try some spelling variations:
nghiem tien » nghiem tieng, nghiem tin, nghiem tren
thi nghiem » thuc nghiem
thu thuat » phau thuat, thu hut
thuat thi » thuat thie, thuat thoi, khuat thi
nghiem ve » nghiem va, nghiem vi, nghiem de
phai trai » phai tai, khac trai, thai tai
nghiem te » nghiem de, nghiem tren, nghiem thi
cu phai » cu phap, vu phai, cuu phat
ve hoc » te hoc, va hoc, vi hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu thuat thi nghiem ve hoc ) or ( cu phai trai ((nghiem te) OR (nghiem tien)) hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu thuat thi nghiem ve hoc ) OR ( cu phai trai ((nghiem te) OR (nghiem tien)) hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thu thuat thi nghiem ve hoc ) or ( cu phai trai ((nghiem te) OR (nghiem tien)) hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( thu thuat thi nghiem ve hoc ) or ( cu phai trai ((nghiem te) OR (nghiem tien)) hoc ))*.