Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
lai cua » dai cua, hai cua, lai chau
dan lai » dan loai, dan lap, dan lat
nam dan » nam dinh
thu nam » tu nam, thu nhap, thu nhat
hieu he » hieu ve, hiem he, hieu le
cua tre » cua te, cuu tre, cua triet
ly hang » ly quang
ly nang » ky nang, ly vang, ly quang
ma hoi » xa hoi, ma hoa, me hoi
he nam » ha nam, nghe nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ly nang) or (ly hang)) ((ma hoi) or (mai hoi)). hieu he nam thu nam dan lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly nang) OR (ly hang)) ((ma hoi) OR (mai hoi)). hieu he nam thu nam dan lai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly nang) or (ly hang)) ((ma hoi) or (mai hoi)). hieu he nam thu nam dan lai cua tre*.