Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
thuc dan » thuc hanh, hoc dan, thuc vat
hanh dai » hanh tai, hanh dao, vanh dai
cua viet » ca viet, hoa viet, cua vat
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
hieu vi » hieu voi, hieu va, hieu ve
thuc va » thuc vat, thuc day

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ty lang xa hoi. hieu vi pham ((thuc va) or (thuc dan)) hanh dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ty lang xa hoi. hieu vi pham ((thuc va) OR (thuc dan)) hanh dai cua viet.
• Adding a wildcard symbol may retrieve word variants: doc sach ty lang xa hoi. hieu vi pham ((thuc va) or (thuc dan)) hanh dai cua viet*.