Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
dan thai » dang thai, dan thi, dan than
thai cuu » thai cua, tai cuc, thi cuc
tu sach » thu sach, su sach, te sach
van cac » van hac, van cau, van bac
cuu tre » cua tre, cau tren, cau treo
y nang » ly nang, v nang, may nang
va dan » ca dan, va dao, va dau

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 ((y nang) OR (ky nang)) xa hoi. hieu van cac nuoc va dan thai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ky nang)) xa hoi. hieu van cac nuoc va dan thai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (ky nang)) xa hoi. hieu van cac nuoc va dan thai cuu tre*.