Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cam luc » cam xuc, cau luc
tai cuu » tai cuc, tai buu, tai cua
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ky dang xa hoi. hieu ve cam luc ((va hanh) OR (va danh)) tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky dang xa hoi. hieu ve cam luc ((va hanh) OR (va danh)) tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky dang xa hoi. hieu ve cam luc ((va hanh) OR (va danh)) tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky dang xa hoi. hieu ve cam luc ((va hanh) OR (va danh)) tai cuu tre*.