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
truc va » thuc vat, trung va
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
van cam » van nam, van lam, van cau
lang co » lang o, nang co, tang co
tu lang » cu lang, tu lanh, xu lang
cua tre » cua te, cuu tre, cua triet
co hoi » co hoc, co loi

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 tu lang co hoi. hieu van cam ((truc va) OR (thuc va)) hanh sinh cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu lang co hoi. hieu van cam ((truc va) OR (thuc va)) hanh sinh cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach tu lang co hoi. hieu van cam ((truc va) OR (thuc va)) hanh sinh cua tre*.