Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
cac thuc » cac thu, can thuc, cay thuc
dang tao » sang tao, nang tao, vang tao
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
dan hai » doan hai, dang hai, dan khai
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
tao hoi » tao khoi, tao boi, tay hoi
ky dang » ky nang, ky danh
va dan » ca dan, va dao, va dau
cua tu » cua tuc, cua su, cua cu

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