Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
duc gia » quoc gia
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam
ve cuu » ve cau, ve chu, ve cum
ve cua » le cua, de cua, te cua
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 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 y nang x hoi. hieu ve cam duc gia thanh ((ve cuu) OR (ve cua)) tre*.