Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thuc dan » thuc hanh, hoc dan, thuc vat
hanh tai » thanh tai, hang tai, han tai
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc day
su tien » su kien, su hien, tu tieng
nang o » nang co, nang ho, nang ro
ve cac » va cac, vien cac
tai su » tai so, tai tu, lai su
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky nang o hoi. hieu ve cac ((thuc va) or (thuc dan)) hanh tai su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang o hoi. hieu ve cac ((thuc va) OR (thuc dan)) hanh tai su tien.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang o hoi. hieu ve cac ((thuc va) or (thuc dan)) hanh tai su tien*.