Perhaps you should try some spelling variations:
ban thanh » ban hang
sang tai » hang tai, sang tao, tang tai
ban hanh » ban hang
toc sac » toc sach, toc san, hoc sach
lap cua » lai cua, tap cua, lam cua
hieu va » lieu va, hieu qua
hieu ve » hieu van
tai hoi » tai khoi, dai hoi, tai hai
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
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: toc sac ky sang tai hoi. ((hieu ve) or (hieu va)) pham duc ((ban thanh) OR (ban hanh)) lap cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky sang tai hoi. ((hieu ve) OR (hieu va)) pham duc ((ban thanh) OR (ban hanh)) lap cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ky sang tai hoi. ((hieu ve) or (hieu va)) pham duc ((ban thanh) OR (ban hanh)) lap cua te".
• Adding a wildcard symbol may retrieve word variants: toc sac ky sang tai hoi. ((hieu ve) or (hieu va)) pham duc ((ban thanh) OR (ban hanh)) lap cua te*.