Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
va triet » va thiet, va trien, ve triet
nang xa » nang x, lang xa, nang ma
tu sach » su sach, te sach, tu cach
va cham » va chat, va tham
va dinh » van dinh, va kinh, va tinh
dinh cu » dinh cuu, dinh chuc, dinh chau
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam
cu va » cuu va, tu va, su va

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) OR (tu sach)) y nang xa hoi. hieu ((ve cam) or (va cham)) duc va dinh cu va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) y nang xa hoi. hieu ((ve cam) OR (va cham)) duc va dinh cu va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) y nang xa hoi. hieu ((ve cam) or (va cham)) duc va dinh cu va triet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) y nang xa hoi. hieu ((ve cam) or (va cham)) duc va dinh cu va triet*.