Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
dau thi » cau thi, dao thi, dam thi
dan thi » dang thi, tran thi, dinh thi
cuu tre » cua tre, cau tren, cau treo
xuc va » tuc va, luc va, xac va

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. lieu va cac ((xuc va) or (duc va)) ((dau thi) OR (dan thi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. lieu va cac ((xuc va) OR (duc va)) ((dau thi) OR (dan thi)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. lieu va cac ((xuc va) or (duc va)) ((dau thi) OR (dan thi)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. lieu va cac ((xuc va) or (duc va)) ((dau thi) OR (dan thi)) cuu tre*.