Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
nang mai » nang ma, nang tai, lang mai
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
qua cac » cua cac
tu sach » thu sach, te sach, tu cach
mai hoi » mai khoi, dai hoi, lai hoi
su sach » so sach, vu sach
y nang » ky nang, ly nang, v nang
ca cuu » cap cuu, cua cuu, ca cau
ca cua » co cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (su sach)) y nang mai hoi. hieu qua cac thuc va hanh ((ca cuu) or (ca cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y nang mai hoi. hieu qua cac thuc va hanh ((ca cuu) OR (ca cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) y nang mai hoi. hieu qua cac thuc va hanh ((ca cuu) or (ca cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) y nang mai hoi. hieu qua cac thuc va hanh ((ca cuu) or (ca cua)) tre*.