Perhaps you should try some spelling variations:
hanh sinh » hanh tinh, hanh dinh, hinh sinh
sinh cua » manh cua, dinh cuu, sinh va
hieu van » hieu va, thien van, lieu va
te sach » toc sach
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
y lang » _ lang, tay lang, yen lang
xuc va » duc va, tuc va, luc va
o lang » hoa lang, hoi lang

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 ((y lang) OR (o lang)) ha hoi. hieu van cac ((xuc va) or (thuc vat)) hanh sinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y lang) OR (o lang)) ha hoi. hieu van cac ((xuc va) OR (thuc vat)) hanh sinh cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y lang) OR (o lang)) ha hoi. hieu van cac ((xuc va) or (thuc vat)) hanh sinh cua tre*".