Perhaps you should try some spelling variations:
thien van » thi van
thuc day » thuc dan, thuc vat
hanh dan » thanh dan, hanh san, canh dan
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan
van am » van nam, van lam, van dam
dan su » dang su

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 xa hoi. thien van am ((thuc va) or (thuc day)) hanh dan su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. thien van am ((thuc va) OR (thuc day)) hanh dan su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. thien van am ((thuc va) or (thuc day)) hanh dan su triet*.