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

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) OR (dao thai)) cuu 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) OR (dao thai)) cuu 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) OR (dao thai)) cuu 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) OR (dao thai)) cuu tre*.