Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
vai cua » hai cua, lai cua, bai cua
ve cac » va cac, vien cac
du van » duy van, duc van, tu van
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: ((thu sach) OR (tu sach)) ky nang x hoi. hieu ve cac du van hanh ((vai cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky nang x hoi. hieu ve cac du van hanh ((vai cua) OR (dai cua)) te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) ky nang x hoi. hieu ve cac du van hanh ((vai cua) or (dai cua)) te*".