Perhaps you should try some spelling variations:
sach thi » sach thu, sach thieu, sach tham
sach tai » sach bai, sach tham, sach dao
thanh xa » thanh ha, thanh va, thanh ba
dac hanh » dao hanh, duc hanh, doc hanh
hieu he » hieu ve, hiem he, hieu le
thu dac » thu duc, thu xac, thu da
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
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 thi) or (sach tai)) thanh xa hoi. hieu he nam thu dac hanh ((vai cua) OR (hai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thi) OR (sach tai)) thanh xa hoi. hieu he nam thu dac hanh ((vai cua) OR (hai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thi) or (sach tai)) thanh xa hoi. hieu he nam thu dac hanh ((vai cua) OR (hai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thi) or (sach tai)) thanh xa hoi. hieu he nam thu dac hanh ((vai cua) OR (hai cua)) triet*.