Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, cuoc cach, cuon sach
toc sach » doc sach, thuoc sach, toc san
hoc sach » hoc sinh, hoc cac, hoc anh
dam thuc » am thuc, dan thuc, nam thuc
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
v nang » va nang, vu nang, van nang
va dam » van dam, va dao, va dau
vi cua » vai cua, di cua
cua te » cua tu

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) OR (nuoc sach))) or (hoc sach)) v nang xa hoi. hieu va dam thuc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((toc sach) OR (nuoc sach))) OR (hoc sach)) v nang xa hoi. hieu va dam thuc va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((toc sach) OR (nuoc sach))) or (hoc sach)) v nang xa hoi. hieu va dam thuc va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((((toc sach) OR (nuoc sach))) or (hoc sach)) v nang xa hoi. hieu va dam thuc va hanh vi cua te*.