Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dam thuc » am thuc, dan thuc, nam thuc
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
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 (hoc sinh)) 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 (hoc sinh)) v nang xa hoi. hieu va dam thuc va hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sinh)) v nang xa hoi. hieu va dam thuc va hanh vi cua te*.