Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thien van » thi van
ban thanh » ban hanh, ban hang
thanh tai » thanh hai, thanh toan, doanh tai
nam duoc » da duoc, dat duoc, nam moc
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
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: tu sach y nang xa hoi. ((lieu va) or (thien van)) ((nam duoc) OR (nam thuoc)) ban thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. ((lieu va) OR (thien van)) ((nam duoc) OR (nam thuoc)) ban thanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. ((lieu va) or (thien van)) ((nam duoc) OR (nam thuoc)) ban thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. ((lieu va) or (thien van)) ((nam duoc) OR (nam thuoc)) ban thanh tai cua tre*.