Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cam duc » cao duc, pham duc, nam duoc
bai cua » ban cua, dai cua, bai ca
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang x hoi. hieu van ((cam duc) OR (cam xuc)) van hanh ((bai cua) or (lai chau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. hieu van ((cam duc) OR (cam xuc)) van hanh ((bai cua) OR (lai chau)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. hieu van ((cam duc) OR (cam xuc)) van hanh ((bai cua) or (lai chau)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. hieu van ((cam duc) OR (cam xuc)) van hanh ((bai cua) or (lai chau)) tre*.