Perhaps you should try some spelling variations:
bao thuc » cao thuoc, am thuc, va thuc
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
va bao » va bai
va cuu » va cau, va chu
vu huu » vu huy, tu huu

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