Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thuc day » thuc dan, thuc vat
hanh dan » thanh dan, hanh san, canh dan
van lam » van nam
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan
nang xa » nang x, lang xa, nang ma
tu sach » thu sach, su sach, te sach
van am » van nam, van dam, van ai
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) OR (van lam)) ((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) OR (van lam)) ((thuc va) OR (thuc day)) hanh dan su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. thien ((van am) OR (van lam)) ((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) OR (van lam)) ((thuc va) or (thuc day)) hanh dan su triet*.