Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
hanh de » hanh ve, hanh kem
va hanh » van hanh, va thanh, va danh
de cua » le cua, te cua, dieu cua
luc va » duc va, tuc va, loc va
ve cau » ke cau, va cau, ve cac
y nang » ky nang, ly nang, v nang
cua te » cua tu
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: ((toc sach) OR (hoc sach)) y nang x hoi. hieu ((ve cau) or (ket cau)) luc va hanh de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) y nang x hoi. hieu ((ve cau) OR (ket cau)) luc va hanh de cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) y nang x hoi. hieu ((ve cau) or (ket cau)) luc va hanh de cua te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) y nang x hoi. hieu ((ve cau) or (ket cau)) luc va hanh de cua te*.