Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban hang » ngan hang
doi cua » dai cua, hoi cua
nang mo » nang meo, nang ma, nang co
hieu va » lieu va, hieu qua
cam cuc » cam xuc, cham cuu, pham cuc
va cam » va cham, va cac, va cao
mo hoi » mo phoi, mo hoc, co hoi
cua te » cua tu

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 nang mo hoi. hieu va cam cuc ((ban hanh) or (ban hang)) doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky nang mo hoi. hieu va cam cuc ((ban hanh) OR (ban hang)) doi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky nang mo hoi. hieu va cam cuc ((ban hanh) or (ban hang)) doi cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ky nang mo hoi. hieu va cam cuc ((ban hanh) or (ban hang)) doi cua te*.