Perhaps you should try some spelling variations:
thi hang » thi hanh, thi nang, thi hong
thuoc va » thuc va, thuong va, thuoc tai
sach thi » sach thu, sach tai, sach thieu
thuoc ma » hoc ma, duoc ma
hanh vai » hanh vi, hanh tai, hanh van
su sach » so sach, vu sach
hang xa » hoang xa, hang va, hang ca
hieu ve » hieu va, hieu van
hanh va » hang va, hanh vi
ve nam » he nam, va nam, le nam

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 thi hang xa hoi. hieu ve nam ((thuoc va) OR (thuoc ma)) ((hanh vai) or (hanh va)) cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thi hang xa hoi. hieu ve nam ((thuoc va) OR (thuoc ma)) ((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 ve nam ((thuoc va) OR (thuoc ma)) ((hanh vai) or (hanh va)) cua vat".
• Adding a wildcard symbol may retrieve word variants: su sach thi hang xa hoi. hieu ve nam ((thuoc va) OR (thuoc ma)) ((hanh vai) or (hanh va)) cua vat*.