Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cam thuc » am thuc, nam thuc, cam thu
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
di cua » dai cua, doi cua, de cua
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 (thuoc sach)) ky nang xa hoi. hieu va cam thuc ((gia thanh) or (van hanh)) di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuoc sach)) ky nang xa hoi. hieu va cam thuc ((gia thanh) OR (van hanh)) di cua te.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuoc sach)) ky nang xa hoi. hieu va cam thuc ((gia thanh) or (van hanh)) di cua te*.