Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ban hanh » ban hang
cac bac » cac bai, cac ban, cac cach
vai cua » hai cua, lai cua, bai cua
hieu ve » hieu va, hieu van
cac dac » cac dan, cac dai, cac tac
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
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 v nang x hoi. hieu ve ((cac dac) OR (cac bac)) ban hanh ((vai cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach v nang x hoi. hieu ve ((cac dac) OR (cac bac)) ban hanh ((vai cua) OR (dai cua)) te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach v nang x hoi. hieu ve ((cac dac) OR (cac bac)) ban hanh ((vai cua) or (dai cua)) te*".