Perhaps you should try some spelling variations:
sang tao » hang tai
cac thuc » cach thuc, cac thu, can thuc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
dan vai » dan tai, dan vat, den vai
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
hieu ve » hieu van
tao hoi » tao khoi, tao boi, tay hoi
ky sang » ky nang, ky dang, ky tang
dan va » doan va, dan ca, ban va
cua te » cua tu

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 ky sang tao hoi. ((hieu ve) or (hieu va)) cac thuc va ((dan vai) OR (dan va)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang tao hoi. ((hieu ve) OR (hieu va)) cac thuc va ((dan vai) OR (dan va)) cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang tao hoi. ((hieu ve) or (hieu va)) cac thuc va ((dan vai) OR (dan va)) cua te*".