Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nang hoc » nang doc, nang luc, dong hoc
van hanh » van thanh, ban hanh, van anh
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
hoc hoc » hoc hoa, toc hoc, hoc hoi
va cham » va chat, va tham
vu cham » vu kham, tu cham, qua cham
duc van » duc va, duc tan, duc manh
hanh va » hang va, hanh vi
va cau » van cau, va cac, va dau

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 ky nang hoc hoc. hieu ((va cham) or (vu cham)) duc van hanh va cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang hoc hoc. hieu ((va cham) OR (vu cham)) duc van hanh va cau tren.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang hoc hoc. hieu ((va cham) or (vu cham)) duc van hanh va cau tren*.