Perhaps you should try some spelling variations:
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
co thuc » do thuc, co thua, mo thuc
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
vai cua » hai cua, lai cua, bai cua
va co » vo co

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 co thuc va dinh ((vai cua) OR (dai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu nang xa hoi. hieu va co thuc va dinh ((vai cua) OR (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach tu nang xa hoi. hieu va co thuc va dinh ((vai cua) OR (dai cua)) tre*.