Perhaps you should try some spelling variations:
sang tao » hang tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hai cua » thai cua, dai cua, hoi cua
cac tuc » cac toc, cac tu, cac tac
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
xa dan » ca dan, xa dai, ma dan
va dan » ca dan, va dao, va dau
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: su sach ky sang tao hoi. ((hieu ve) or (hieu va)) cac tuc ((xa dan) OR (va dan)) hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang tao hoi. ((hieu ve) OR (hieu va)) cac tuc ((xa dan) OR (va dan)) hai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky sang tao hoi. ((hieu ve) or (hieu va)) cac tuc ((xa dan) OR (va dan)) hai cua te*".