Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
va cham » va chat, va tham
cao hoi » cau hoi, co hoi, cao hoc
ty nang » ky nang, ty xang, ty hang
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: tu sach ty nang cao hoi. hieu ((va cham) or (va cac)) loc ((va hanh) OR (va thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang cao hoi. hieu ((va cham) OR (va cac)) loc ((va hanh) OR (va thanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang cao hoi. hieu ((va cham) or (va cac)) loc ((va hanh) OR (va thanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang cao hoi. hieu ((va cham) or (va cac)) loc ((va hanh) OR (va thanh)) vi cua tre*.