Perhaps you should try some spelling variations:
phan dau » phan tu, hang dau
te sach » toc sach
van dau » van dao
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
truc va » thuc va, trung va
vu kham » vu khanh
hieu vu » hieu va, hieu ve, hieu su
cao hoc » co hoc, cho hoc, chat hoc

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 nang cao hoc. hieu vu kham ((truc va) or (thuc vat)) ((van dau) OR (phan dau)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang cao hoc. hieu vu kham ((truc va) OR (thuc vat)) ((van dau) OR (phan dau)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang cao hoc. hieu vu kham ((truc va) or (thuc vat)) ((van dau) OR (phan dau)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang cao hoc. hieu vu kham ((truc va) or (thuc vat)) ((van dau) OR (phan dau)) cua tre*.