Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
cuu tre » cau tren, cau treo
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cua triet, dua tren
van cam » van nam, van lam, van cau
vang xa » lang xa, mang xa, ang xa
ly vang » ly hang, ly van, ly quang
luc va » duc va, tuc va, loc va

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 ly vang xa hoi. hieu van cam ((luc va) or (thuc va)) hanh vi ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly vang xa hoi. hieu van cam ((luc va) OR (thuc va)) hanh vi ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly vang xa hoi. hieu van cam ((luc va) or (thuc va)) hanh vi ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach ly vang xa hoi. hieu van cam ((luc va) or (thuc va)) hanh vi ((cuu tre) OR (cua tre))*.