Perhaps you should try some spelling variations:
doc thuc » hoc thuc, do thuc, hoc thuoc
thuc dan » thuc hanh, hoc dan, thuc vat
trinh vi » trinh va, trinh ve, trinh viet
trong xa » trong xay, trong ca, trong xu
dinh vi » dinh ve, dinh viet, dinh tri
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
cuu tre » cua tre, cau tren, cau treo
ve doc » ve duoc, va doc, me doc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((tang xa) or (trong xa)) hoi. hieu ve doc thuc dan ((dinh vi) or (trinh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((tang xa) OR (trong xa)) hoi. hieu ve doc thuc dan ((dinh vi) OR (trinh vi)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach y ((tang xa) or (trong xa)) hoi. hieu ve doc thuc dan ((dinh vi) or (trinh vi)) cuu tre*.