Perhaps you should try some spelling variations:
chat truc » cau truc, chat xuc
hang dau » hang va, hang tai
hieu cao » chieu cao, hieu ca, kieu cao
danh dau » lanh dao, danh tu, xang dau
hieu cac » hieu luc, hieu va, hieu van
truc va » thuc va, thuc vat, trung va
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
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 ty lang xa hoi. ((hieu cao) or (hieu cac)) chat truc va ((danh dau) OR (hang dau)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty lang xa hoi. ((hieu cao) OR (hieu cac)) chat truc va ((danh dau) OR (hang dau)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty lang xa hoi. ((hieu cao) or (hieu cac)) chat truc va ((danh dau) OR (hang dau)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty lang xa hoi. ((hieu cao) or (hieu cac)) chat truc va ((danh dau) OR (hang dau)) cua tre*.