Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
lang dai » lang hai, lang mai, lang chai
hoi cua » hoi chuc
hai cua » thai cua, dai cua, lai cua
bai cua » ban cua, dai cua, bai ca
xuc van » duc van, luc van, vuc van
sach ky » sac ky, sach y, sach ty
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
ky lang » ky nang, ky dang, ky tang
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky lang dai hoi. hieu ve cac xuc van hanh ((bai cua) or (((hai cua) OR (hoi cua)))) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang dai hoi. hieu ve cac xuc van hanh ((bai cua) OR (((hai cua) OR (hoi cua)))) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky lang dai hoi. hieu ve cac xuc van hanh ((bai cua) or (((hai cua) OR (hoi cua)))) tre*".