Perhaps you should try some spelling variations:
te sach » toc sach
co thuc » co thua, mo thuc, so thuc
danh va » doanh va, hanh va, anh va
va danh » va dinh, va dan, va hanh
do thuc » hoc thuc, dan thuc
cua tre » cua te, cuu tre, cua triet
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
va cua » va chua, via cua, ca 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 tu nang xa hoi. ((hieu va) or (hieu qua)) ((co thuc) OR (do thuc)) va danh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nang xa hoi. ((hieu va) OR (hieu qua)) ((co thuc) OR (do thuc)) va danh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu nang xa hoi. ((hieu va) or (hieu qua)) ((co thuc) OR (do thuc)) va danh va cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach tu nang xa hoi. ((hieu va) or (hieu qua)) ((co thuc) OR (do thuc)) va danh va cua tre*.