Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » hieu va, thien van, lieu va
chu treo » cau treo, cu tren, cau tren
su sach » so sach, vu sach
ly nang » ly hang, ly vang, ly quang
cao hoi » cau hoi, co hoi, cao hoc
hai chu » hai chau, hoi chu, hai chi
tuc va » thuc va, truc va, duc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ly nang) OR (ky nang)) cao hoi. hieu van nam ((tuc va) or (tuc xa)) thanh hai chu treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly nang) OR (ky nang)) cao hoi. hieu van nam ((tuc va) OR (tuc xa)) thanh hai chu treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly nang) OR (ky nang)) cao hoi. hieu van nam ((tuc va) or (tuc xa)) thanh hai chu treo".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly nang) OR (ky nang)) cao hoi. hieu van nam ((tuc va) or (tuc xa)) thanh hai chu treo*.