Perhaps you should try some spelling variations:
thi hanh » thi thanh
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
ty hang » ly hang, ty xang, thi hang
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua
ve cai » va cai, ve cac, ve tai

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