Perhaps you should try some spelling variations:
sach taieu » sach thieu, sach tien, cach tieu
sach tai » sach bai, sach tham, sach dao
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
cua viet » ca viet, hoa viet, cua vat
hang xa » hoang xa, hang va, hang ca
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vi cua » vai cua, di cua

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 tai) or (sach taieu)) hang xa hoi. hieu van nam thuc va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tai) OR (sach taieu)) hang xa hoi. hieu van nam thuc va hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach tai) or (sach taieu)) hang xa hoi. hieu van nam thuc va hanh vi cua viet*.