Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach tham
nam thuc » nam thuoc, am thuc, nam thu
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
hanh vai » hanh vi, hanh va, hanh tai
va triet » va thiet, va trien, ve triet
hanh xa » hanh va, hanh ma, hanh xu
hieu ve » hieu va, hieu van
ve nam » he nam, va nam, le nam
vai va » mai va, dai va, hai va

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 thi) or (sach thieu)) hanh xa hoi. hieu ve nam thuc day hanh vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thi) OR (sach thieu)) hanh xa hoi. hieu ve nam thuc day hanh vai va triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach thi) or (sach thieu)) hanh xa hoi. hieu ve nam thuc day hanh vai va triet*.