Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tinh vai » tinh va, tinh hai, tinh bai
dau tren » dat tren, dau tieng, dau trong
dau tien » van tien
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van dam
van cau » van dau, van hau, van chat
va tinh » may tinh

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ly nang xa hoi. hieu ((van cam) OR (van cau)) tu va tinh vai ((dau tren) OR (dau tien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ly nang xa hoi. hieu ((van cam) or (van cau)) tu va tinh vai ((dau tren) OR (dau tien))~".
• Adding a wildcard symbol may retrieve word variants: toc sach ly nang xa hoi. hieu ((van cam) or (van cau)) tu va tinh vai ((dau tren) OR (dau tien))*.