Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dau thai » dau thau, da thai, dao thai
nang xa » nang x, lang xa, nang ma
dat duc » dat duoc, dao duc, dat doc
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
y nang » ky nang, ly nang, v nang
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang xa hoi. ((hieu qua) or (lieu va)) dat duc va dau thai ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang xa hoi. ((hieu qua) OR (lieu va)) dat duc va dau thai ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang xa hoi. ((hieu qua) or (lieu va)) dat duc va dau thai ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang xa hoi. ((hieu qua) or (lieu va)) dat duc va dau thai ((cuu tre) OR (cua tre))*.