Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
nang lai » nang tai, mang lai, nang cai
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach tu, sach thu
duc van » duc va, duc tan, duc manh
cu tren » tu tren, dua tren
lai hoi » dai hoi, lai hoa, lai roi
ty nang » ky nang, ty xang, ty hang
ve cau » ke cau, va cau, ve cac
va cai » va bai, va dai, va cao
vai cu » vai cua, van cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang lai hoi. hieu ((((va cai) or (ve cau))) or (va cac)) duc van hanh vai cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang lai hoi. hieu ((((va cai) OR (ve cau))) OR (va cac)) duc van hanh vai cu tren.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang lai hoi. hieu ((((va cai) or (ve cau))) or (va cac)) duc van hanh vai cu tren*.