Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
va dinh » van dinh, va kinh, vu dinh
va tinh » may tinh
nang xa » nang x, lang xa, nang ma
vai cau » va cau, van cau, vai cac
va cham » va chat, va tham
va cam » va cac, va cao, va cai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hieu ((va cam) or (va cham)) o ((va dinh) OR (va tinh)) vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu ((va cam) OR (va cham)) o ((va dinh) OR (va tinh)) vai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu ((va cam) or (va cham)) o ((va dinh) OR (va tinh)) vai cau tren".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu ((va cam) or (va cham)) o ((va dinh) OR (va tinh)) vai cau tren*.