Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
nang co » nang cao, nang doc, nang noi
ty nang » ky nang, ty xang, ty hang
doi cua » dai cua, hoi cua
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) OR (doc sach)) ty nang co hoc. hieu ve cac xuc ((van hanh) or (ban hanh)) doi cua cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ty nang co hoc. hieu ve cac xuc ((van hanh) OR (ban hanh)) doi cua cac*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) ty nang co hoc. hieu ve cac xuc ((van hanh) or (ban hanh)) doi cua cac*".