Perhaps you should try some spelling variations:
hoi nghiem » hoi nhiem, khoi nghiep, thi nghiem
hoach hoi » hoc hoi, hoach ha, sach hoi
nghiem su » nghiem xu, nghiem ngu, nghiem dau
dao nghe » day nghe, da nghe, nao nghe
dat nghe » day nghe, da nghe, dang nghe
tu lanh » tu hanh, tu lenh, tu manh
su hoc » tu hoc, du hoc, so hoc
d hoc » du hoc, ad hoc, de 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 lanh ((dao nghe) OR (dat nghe)) d hoc ) or ( thu hoach hoi nghiem su hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu lanh ((dao nghe) OR (dat nghe)) d hoc ) OR ( thu hoach hoi nghiem su hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu lanh ((dao nghe) OR (dat nghe)) d hoc ) or ( thu hoach hoi nghiem su hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( tu lanh ((dao nghe) OR (dat nghe)) d hoc ) or ( thu hoach hoi nghiem su hoc ))*.