Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
te sach » toc sach
va danh » va dinh, dia danh, va thanh
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va thanh, ban hanh
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
va dan » ca dan, va dao, va dau
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang xa hoi. hieu va cam thuc ((va hanh) or (((va danh) OR (va dan)))) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang xa hoi. hieu va cam thuc ((va hanh) OR (((va danh) OR (va dan)))) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang xa hoi. hieu va cam thuc ((va hanh) or (((va danh) OR (va dan)))) di cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang xa hoi. hieu va cam thuc ((va hanh) or (((va danh) OR (va dan)))) di cua tre*.