Perhaps you should try some spelling variations:
nang tai » tang tai, sang tai, nang cao
danh dai » danh dau, danh di, danh sai
hang tai » hang va, dung tai
su sach » so sach, vu sach
thu xac » thau xay
hieu he » hieu ve, hiem he, hieu le
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
he nam » ha nam, nghe nam
thu xa » thu ha, thu xe, thu ba

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((nang tai) OR (hang tai)) hoi. hieu he nam ((thu xa) or (thu xac)) danh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang tai) OR (hang tai)) hoi. hieu he nam ((thu xa) OR (thu xac)) danh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang tai) OR (hang tai)) hoi. hieu he nam ((thu xa) or (thu xac)) danh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang tai) OR (hang tai)) hoi. hieu he nam ((thu xa) or (thu xac)) danh dai cua tre*.