Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
te sach » toc sach
hanh di » hanh vi, hanh de, hang di
qua cac » cua cac
nang o » nang co, nang ho, nang ro
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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 (thu sach)) ky nang o hoi. hieu qua cac ((luc va) or (tuc xa)) hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky nang o hoi. hieu qua cac ((luc va) OR (tuc xa)) hanh di cua te.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky nang o hoi. hieu qua cac ((luc va) or (tuc xa)) hanh di cua te*.