Perhaps you should try some spelling variations:
thi nghiem » thuc nghiem
khanh tam » thanh tam, nhanh tam, khanh nam
nghien du » nghiep du, nghien cuu, nghiem dau
hanh tam » thanh tam, nhanh tam, hanh tram
hach thi » cach thoi, quach thi, nhanh thi
nghiem y » nghiep y, nghiem _, nghiem d
tu hach » tu hanh, tu cach, tu sach
du hoc » tu hoc, duoc hoc

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu ((khanh tam) OR (hanh tam)) nghien du hoc ) OR ( tu hach thi nghiem y hoc ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu ((khanh tam) OR (hanh tam)) nghien du hoc ) or ( tu hach thi nghiem y hoc ))~".
• Adding a wildcard symbol may retrieve word variants: (( tu ((khanh tam) OR (hanh tam)) nghien du hoc ) or ( tu hach thi nghiem y hoc ))*.