Perhaps you should try some spelling variations:
tinh via » tinh gia, tinh va, tinh vi
tu sach » thu sach, su sach, tu cach
hieu va » lieu va, hieu qua
via cua » gia cua, gian cua, giau cua
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
te sach » toc sach
xu va » xu van, tu va, su 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) or (te sach)) ky nang xa hoi. ((hieu ve) OR (hieu va)) chao xu va tinh via cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang xa hoi. ((hieu ve) OR (hieu va)) chao xu va tinh via cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang xa hoi. ((hieu ve) OR (hieu va)) chao xu va tinh via cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang xa hoi. ((hieu ve) OR (hieu va)) chao xu va tinh via cua tre*.