Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van thanh » ban thanh, van tuan
thai tren » thai tran, thi tren, thai trang
thanh vi » hanh vi, thanh va, thanh ve
cham duc » pham duc, cham soc, pham duy
ky danh » ky anh, ky dang
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
duc van » duc va, duc tan, duc manh
cu tren » tu tren, dua tren
y danh » ly danh, 1 danh, 2 danh

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 ((y danh) or (ky danh)) xa hoi. hieu vu cham duc van thanh vi ((cu tren) or (thai tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((y danh) OR (ky danh)) xa hoi. hieu vu cham duc van thanh vi ((cu tren) OR (thai tren)).
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((y danh) or (ky danh)) xa hoi. hieu vu cham duc van thanh vi ((cu tren) or (thai tren))*.