Perhaps you should try some spelling variations:
danh thai » anh thai, dang thai, dinh thai
hieu van » hieu va, thien van, lieu va
van chat » cao chat
thai cua » than cua, tai cuc, tri cua
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cao hoc » co hoc, cho hoc, chat hoc
truc va » thuc va, trung va
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: tu sach ky nang cao hoc. hieu van chat ((truc va) or (thuc vat)) danh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cao hoc. hieu van chat ((truc va) OR (thuc vat)) danh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cao hoc. hieu van chat ((truc va) or (thuc vat)) danh thai cua tre*.