Perhaps you should try some spelling variations:
khach nhiem » trach nhiem
bat khach » bat khanh, dat khach, vay khach
nghe duoc » nghiem duoc, nghe nuoi, che duoc
duoc hoc » quoc hoi
huu loc » muu luoc
hau loc » phau hoc
tu sach » thu sach, su sach, te sach
sach va » sach xa, sach ha, sach dao
va nghe » van nghe, ve nghe, va nghi
tu bat » tu ban, tu dat

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu bat khach nhiem ((huu loc) or (hau loc)) ) or ( tu sach va nghe duoc hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu bat khach nhiem ((huu loc) OR (hau loc)) ) OR ( tu sach va nghe duoc hoc )).
• Adding a wildcard symbol may retrieve word variants: (( tu bat khach nhiem ((huu loc) or (hau loc)) ) or ( tu sach va nghe duoc hoc ))*.