Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
sach tu » sach thu, cach tu, sach uu
sach ty » sach y, sach thu, xach tay
hang o » hang do, hang o2, hoang o
ve cai » va cai, ve cac, ve tai
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua
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 ((sach tu) or (sach ty)) hang o hoi. hieu ((ve cai) or (va cam)) duc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (sach ty)) hang o hoi. hieu ((ve cai) OR (va cam)) duc va hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) or (sach ty)) hang o hoi. hieu ((ve cai) or (va cam)) duc va hanh vi cua te*.