Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((ty nang) OR (ty hang)) xa hoi. hieu va cam xuc ((va hanh) or (gia thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ty nang) OR (ty hang)) xa hoi. hieu va cam xuc ((va hanh) OR (gia thanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ty nang) OR (ty hang)) xa hoi. hieu va cam xuc ((va hanh) or (gia thanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ty nang) OR (ty hang)) xa hoi. hieu va cam xuc ((va hanh) or (gia thanh)) vi cua tre*.