Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
duc gia » quoc gia
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
ve cuu » ve cau, ve chu, ve cum
ve cua » le cua, de cua, te cua
ve cam » ve cham, ve cac, va cam
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 cam duc gia thanh ((ve cuu) or (ve cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) y nang x hoi. hieu ve cam duc gia thanh ((ve cuu) OR (ve cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) y nang x hoi. hieu ve cam duc gia thanh ((ve cuu) or (ve cua)) tre*".