Perhaps you should try some spelling variations:
hanh may » hanh ma, hanh mau, hanh ngay
va thieu » va thiet, va hieu, va tieu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
nang o » nang co, nang ho, nang ro
va cam » va cham, va cac, va cao
tuc va » truc va, tuc xa, duc va
may va » may vi, day va
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: tu sach ky nang o hoi. lieu va cam ((tuc va) or (thuc va)) hanh may va thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang o hoi. lieu va cam ((tuc va) OR (thuc va)) hanh may va thieu.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hoi. lieu va cam ((tuc va) or (thuc va)) hanh may va thieu*.