Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham luc » cham soc, nhan luc, cham cuu
ky long » ky cong, ky trong, khi long
sy long » sy luong, quy long
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
luc va » duc va, tuc va, loc va
vi va » vi van, vai va, vu va
thiet* » thieu*

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 ((ky long) or (sy long)) xa hoi. hieu ve cham luc va danh vi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky long) OR (sy long)) xa hoi. hieu ve cham luc va danh vi va thiet*.