Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cap nuoc » dat nuoc
dinh thi » dinh tri
tu sach » thu sach, su sach, te sach
van cap » van cau, van dap, van ca
dan thi » dang thi, tran thi, dan thuc
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van 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) OR (v nang)) xa hoi. hieu van cap nuoc va ((dan thi) or (dinh thi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (v nang)) xa hoi. hieu van cap nuoc va ((dan thi) OR (dinh thi)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (v nang)) xa hoi. hieu van cap nuoc va ((dan thi) or (dinh thi)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (v nang)) xa hoi. hieu van cap nuoc va ((dan thi) or (dinh thi)) cuu tre*.