Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
cau treo » cau theo, cau tren, cau triet
van cam » van nam, van lam, van dam
van cau » van dau, van hau, van chat
y nang » ky nang, ly nang, v nang
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang x ho. hieu ((van cam) or (van cau)) duc va thanh vi cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang x ho. hieu ((van cam) OR (van cau)) duc va thanh vi cau treo.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang x ho. hieu ((van cam) or (van cau)) duc va thanh vi cau treo*.