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

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 dao 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 dao 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 dao cua tre*.