Perhaps you should try some spelling variations:
danh dai » danh dau, danh di, danh sai
hieu cao » chieu cao, hieu cac, kieu cao
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
truc va » thuc vat, trung va
sach ky » sac ky, sach y, sach ty
hieu ca » hieu cac, hieu cua, hieu va
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((hieu cao) OR (hieu ca)) chat ((truc va) OR (thuc va)) danh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. ((hieu cao) or (hieu ca)) chat ((truc va) OR (thuc va)) danh dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu cao) or (hieu ca)) chat ((truc va) OR (thuc va)) danh dai cua tre*.