Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dan thai » dang thai, dan thi, dan than
dinh thi » dinh tri
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van dat » van dao, van dau, dan dat
cuu tre » cua tre, cau tren, cau treo
nuoc » quoc, duoc, ngoc

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 ky nang xa hoi. hieu van dat nuoc va ((dan thai) or (dinh thi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu van dat nuoc va ((dan thai) OR (dinh thi)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu van dat nuoc va ((dan thai) or (dinh thi)) cuu tre*.