Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thuc dan » thuc hanh, hoc dan, thuc vat
sach tu » sach thu, cach tu, sach ty
lai cua » hai cua, lai chau, thai cua
thuc va » thuc vat, thuc day
hieu va » lieu va, hieu qua
cong xa » cong xay, cong xua, cong ha
tu cong » thu cong, te cong, tai cong
va co » vo co

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tu cong xa hoi. hieu va co ((thuc va) or (thuc dan)) danh ((dai cua) or (lai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu cong xa hoi. hieu va co ((thuc va) OR (thuc dan)) danh ((dai cua) OR (lai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: toc sach tu cong xa hoi. hieu va co ((thuc va) or (thuc dan)) danh ((dai cua) or (lai cua)) tre*.