Perhaps you should try some spelling variations:
hieu voi » hieu moi, lieu voi, hieu loi
dua tren » dung tren
tinh lap » trinh lap, tinh lao, dinh lap
va tinh » may tinh
te sach » toc sach
sach lo » sach dao, sach doi, sach hoi
hieu ve » hieu va, hieu van
cao hoi » cau hoi, co hoi, cao hoc
lo nang » ho nang, ly nang, loai nang
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach lo nang cao hoi. ((hieu ve) or (hieu voi)) pham duc va tinh lap ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach lo nang cao hoi. ((hieu ve) OR (hieu voi)) pham duc va tinh lap ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: te sach lo nang cao hoi. ((hieu ve) or (hieu voi)) pham duc va tinh lap ((dua tren) or (cuu tre))*.