Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, van bac
xa hanh » xa thanh, xa khanh, da hanh
va hanh » van hanh, va thanh, va danh
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu
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: vu sach ky nang x hoi. hieu van cac nuoc ((xa hanh) OR (va hanh)) vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. hieu van cac nuoc ((xa hanh) OR (va hanh)) vi ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x hoi. hieu van cac nuoc ((xa hanh) OR (va hanh)) vi ((cua tre) or (cua te))*".