Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi hang » thi hanh, thi nang, thi hong
hanh vai » hanh vi, hanh tai, hanh van
su sach » so sach, vu sach
hang xa » hoang xa, hang va, hang ca
thuc va » thuc vat, thuc dan, thuc day
hanh va » hang va, hanh vi
va nam » van nam, va nay

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thi hang xa hoi. hieu ((va nam) OR (ha nam)) thuc va ((hanh vai) OR (hanh va)) cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thi hang xa hoi. hieu ((va nam) OR (ha nam)) thuc va ((hanh vai) or (hanh va)) cua vat~".
• Adding a wildcard symbol may retrieve word variants: su sach thi hang xa hoi. hieu ((va nam) OR (ha nam)) thuc va ((hanh vai) or (hanh va)) cua vat*.