Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh di » hanh vi, hanh de, hang di
van cam » van nam, van lam, van cau
vu sach » vu bach, su sach, vu khach
ly vang » ly hang, ly van, ly quang
ly lang » ly hang, le lang, ly lanh
cau tre » cau tren, cau treo, cau tra
xuc va » duc va, tuc va, luc va
di cau » da cau, diem cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((ly lang) OR (ly vang)) xa hoi. hieu van cam ((xuc va) or (thuc vat)) hanh di cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ly lang) OR (ly vang)) xa hoi. hieu van cam ((xuc va) OR (thuc vat)) hanh di cau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ly lang) OR (ly vang)) xa hoi. hieu van cam ((xuc va) or (thuc vat)) hanh di cau tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ly lang) OR (ly vang)) xa hoi. hieu van cam ((xuc va) or (thuc vat)) hanh di cau tre*.