Perhaps you should try some spelling variations:
thieu nien » thien nhien
dang xay » dang van, van xay
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
va lanh » va lang, va danh, va hanh
dao cua » day cua, dan cua, do 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 ky dang xay hoi. thieu nien ((dat nuoc) or (cap nuoc)) va lanh ((dao cua) OR (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xay hoi. thieu nien ((dat nuoc) OR (cap nuoc)) va lanh ((dao cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xay hoi. thieu nien ((dat nuoc) or (cap nuoc)) va lanh ((dao cua) OR (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xay hoi. thieu nien ((dat nuoc) or (cap nuoc)) va lanh ((dao cua) OR (dai cua)) tre*.