Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham duc » pham duc, cham soc, pham duy
anh hanh » anh thanh, xanh hanh, anh anh
tu sach » thu sach, su sach, te sach
ty nang » ty xang, ty hang, ly nang
loai ca » loai cay, loai cua, loai va
lai ca » lai cua, lai cam, 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) or (ky nang)) x hoi. hieu van cham duc anh hanh ((lai ca) OR (loai ca)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ky nang)) x hoi. hieu van cham duc anh hanh ((lai ca) OR (loai ca)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ky nang)) x hoi. hieu van cham duc anh hanh ((lai ca) OR (loai ca)) viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ky nang)) x hoi. hieu van cham duc anh hanh ((lai ca) OR (loai ca)) viet*.