Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
so sach » so sanh, bo sach, co sach
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
thuc va » thuc dan, thuc day
van cam » van nam, van lam, van cau
hang xa » hoang xa, hang va, hang ca
y hang » ly hang, ty hang, yu hang

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

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