Perhaps you should try some spelling variations:
hanh sinh » hanh tinh, hanh dinh, hinh sinh
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
te sach » toc sach
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
van cac » van hac, van cau, van bac
sach ky » sac ky, sach y, sach ty
cua tre » cuu tre, cua triet, dua tren
xuc va » duc va, tuc va, luc va
cua te » cua tu

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 ky dang xay hoi. hieu van cac ((xuc va) or (thuc vat)) hanh sinh ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang xay hoi. hieu van cac ((xuc va) OR (thuc vat)) hanh sinh ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang xay hoi. hieu van cac ((xuc va) or (thuc vat)) hanh sinh ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang xay hoi. hieu van cac ((xuc va) or (thuc vat)) hanh sinh ((cua tre) OR (cua te))*.