Perhaps you should try some spelling variations:
chat truc » cau truc, chat xuc
danh dau » lanh dao, hang dau, xang dau
hieu cao » chieu cao, hieu ca, kieu cao
hieu cac » hieu luc, hieu va, hieu van
danh tu » anh tu, doanh thu
truc va » thuc va, thuc vat, trung va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet

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