Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
hai cua » thai cua, hoi cua, lai cua
cam tu » cam thu, nam tu, tam tu
dam tu » nam tu, tam tu, dam thuc

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 ky nang xa hoi. hieu van ((cam tu) OR (dam tu)) va hanh ((dai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu van ((cam tu) OR (dam tu)) va hanh ((dai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu van ((cam tu) OR (dam tu)) va hanh ((dai cua) or (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu van ((cam tu) OR (dam tu)) va hanh ((dai cua) or (hai cua)) tre*.