Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
sach thu » sach thue, sach thieu, sach tham
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cach tu » cach thuc
ve cai » va cai, ve cac, ve tai
hang o » hang do, hang o2, hoang o
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((cach tu) or (sach thu)) hang o hoi. hieu ((ve cai) or (va cac)) duc va hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((cach tu) OR (sach thu)) hang o hoi. hieu ((ve cai) OR (va cac)) duc va hanh vai cua te.
• Adding a wildcard symbol may retrieve word variants: tu ((cach tu) or (sach thu)) hang o hoi. hieu ((ve cai) or (va cac)) duc va hanh vai cua te*.