Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
va hanh » van hanh, va thanh, va danh
hang o » hang do, hang o2, hoang o
va cam » va cham, va cao, va cai
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua
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: su sach ty hang o hoi. hieu ((va cam) or (va cac)) xuc va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty hang o hoi. hieu ((va cam) OR (va cac)) xuc va hanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: su sach ty hang o hoi. hieu ((va cam) or (va cac)) xuc va hanh vi cua vat*.