Perhaps you should try some spelling variations:
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
duc ban » duc tan, duc van, dua ban
ve cam » ve cham, ve cac, va cam
ve cua » le cua, te cua, ve cum
de cua » le cua, te cua, dieu cua
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang x hoi. hieu ve cam ((cua ban) or (duc ban)) hanh ((ve cua) OR (de cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. hieu ve cam ((cua ban) OR (duc ban)) hanh ((ve cua) OR (de cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. hieu ve cam ((cua ban) or (duc ban)) hanh ((ve cua) OR (de cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. hieu ve cam ((cua ban) or (duc ban)) hanh ((ve cua) OR (de cua)) tre*.