Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
cac dai » cac dan, cac bai, can dai
dai van » dao van, dai han, dai va
vai cua » hai cua, lai cua, bai cua
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
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: thuoc sach y nang x hoi. hieu ve cac dai van hanh ((vai cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang x hoi. hieu ve cac dai van hanh ((vai cua) OR (dai cua)) te.
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang x hoi. hieu ve cac dai van hanh ((vai cua) or (dai cua)) te*.