Perhaps you should try some spelling variations:
bao thuc » cao thuoc, am thuc, va thuc
vat hanh » vat thanh, van hanh, va hanh
te sach » toc sach
hieu va » lieu va, hieu qua
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
y nang » ly nang, v nang, may nang
va bao » va bai

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