Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
van dau » van dao, phan dau
vai cua » dai cua, hai cua, lai cua
lang ha » long ha
thuc va » thuc vat, thuc dan, thuc day
sac ky » cac ky, sai ky
ha hoi » hoa hoi, ha noi, xa hoi
cua te » cua tu
ac va » tac va, bac va, mac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sac ky) or (sach thu)) lang ha hoi. hieu van dau ((ac va) or (thuc va)) hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sac ky) OR (sach thu)) lang ha hoi. hieu van dau ((ac va) OR (thuc va)) hanh vai cua te.
• Adding a wildcard symbol may retrieve word variants: so ((sac ky) or (sach thu)) lang ha hoi. hieu van dau ((ac va) or (thuc va)) hanh vai cua te*.