Perhaps you should try some spelling variations:
thien tai » thien van, thien tu, thien va
cham thuc » nham thuc, pham thuc, tham thuc
toc sach » hoc sach, doc sach, thuoc sach
tai cham » thi cham, tam cham, tri cham
dinh day » dinh dat, dinh dao, dinh da
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. thien tai cham thuc va dinh day ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. thien tai cham thuc va dinh day ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. thien tai cham thuc va dinh day ((cua tre) or (su triet))*.