Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
ve chat » va chat, van chat
cua tre » cua te, cuu tre, cua triet
ve cham » va cham, vu cham, ve chim
ty hang » ly hang, ty xang, thi hang
loc va » hoc va, luc va
va cua » va chua, via cua, ca cua

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 ty hang ((xa hoi) or (cau hoi)). hieu ((ve cham) or (ve chat)) loc va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hang ((xa hoi) OR (cau hoi)). hieu ((ve cham) OR (ve chat)) loc va hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty hang ((xa hoi) or (cau hoi)). hieu ((ve cham) or (ve chat)) loc va hanh va cua tre*.