Perhaps you should try some spelling variations:
sang tao » hang tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
vai cua » dai cua, hai cua, lai cua
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
tao hoi » tao khoi, tao boi, tay hoi
hieu ve » hieu van
ky sang » ky nang, ky dang, ky tang
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao
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 tuc ((va dan) OR (ca dan)) vai 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 tuc ((va dan) OR (ca dan)) vai 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 tuc ((va dan) OR (ca dan)) vai cua te*".