Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
toc sach » hoc sach, doc sach, thuoc sach
cham tuc » nham thuc, pham thuc, cham soc
dinh dao » dinh dat, minh dao, dinh cao
cua viet » ca viet, hoa viet, cua vat
thien va » thien van, tien va, thien tai
sach ky » sac ky, sach y, sach ty
va dinh » van dinh, va kinh, va tinh
nang xa » nang x, lang xa, nang ma
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 va ((cham tuc) OR (tham thuc)) va dinh dao ((cua tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. thien va ((cham tuc) OR (tham thuc)) va dinh dao ((cua tre) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. thien va ((cham tuc) OR (tham thuc)) va dinh dao ((cua tre) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. thien va ((cham tuc) OR (tham thuc)) va dinh dao ((cua tre) or (cua viet))*.