Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
diem cau » dieu can
cau tren » cu tren, dau tren, ca tren
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
cac tu » cac thu, cach tu, cac du

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 ty nang xa hoi. lieu va cac tu ((va hanh) or (dia ban)) diem cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang xa hoi. lieu va cac tu ((va hanh) OR (dia ban)) diem cau tren.
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang xa hoi. lieu va cac tu ((va hanh) or (dia ban)) diem cau tren*.