Perhaps you should try some spelling variations:
thieu nien » thien nhien
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
van hanh » van thanh, ban hanh, van anh
dang xay » dang van, van xay
nien cac » vien cac, dien cac, bien cac
dan cua » dan ca, ban cua, dai cua
dao cua » dai cua, day cua, do cua
te sach » toc sach
va hanh » va thanh, va danh, ban hanh
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky dang xay hoi. thieu nien cac nuoc ((va hanh) or (van hanh)) ((dao cua) OR (dan cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang xay hoi. thieu nien cac nuoc ((va hanh) OR (van hanh)) ((dao cua) OR (dan cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang xay hoi. thieu nien cac nuoc ((va hanh) or (van hanh)) ((dao cua) OR (dan cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang xay hoi. thieu nien cac nuoc ((va hanh) or (van hanh)) ((dao cua) OR (dan cua)) tre*.