Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van nang » van quang, van ban, van dong
nang tuc » nang thuc, nang luc, nang tu
tu sach » thu sach, su sach, te sach
va nang » da nang, kha nang, cao nang
xa hanh » xa thanh, xa khanh, va hanh
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua

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