Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
sach ty » sach y, xach tay, sach hay
sach tu » cach tu, sach uu, sach xu
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va tinh » may tinh
tinh di » tinh doi, trinh di, tinh da
cua tre » cua te, cuu tre, cua triet
cac tu » cac thu, cach tu, cac du
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ty) or (((sach tu) OR (sach thu)))) nang xa hoi. hieu va cac tu va tinh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ty) OR (((sach tu) OR (sach thu)))) nang xa hoi. hieu va cac tu va tinh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ty) or (((sach tu) OR (sach thu)))) nang xa hoi. hieu va cac tu va tinh di cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ty) or (((sach tu) OR (sach thu)))) nang xa hoi. hieu va cac tu va tinh di cua tre*.