Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
tham duc » pham duc, tham du, than duc
cua viet » ca viet, hoa viet, cua vat
ty hang » ly hang, ty xang, thi hang
va tham » van tham, va cham, va thanh
va hanh » van hanh, va thanh, va danh
va tinh » may tinh
ty nang » ky nang, ty xang, ly nang
hieu va » lieu va, hieu qua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ((ty nang) or (ty hang)) xa hoi. hieu va tham duc ((va hanh) or (va tinh)) dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((ty nang) OR (ty hang)) xa hoi. hieu va tham duc ((va hanh) OR (va tinh)) dai cua viet.
• Adding a wildcard symbol may retrieve word variants: thuat sach ((ty nang) or (ty hang)) xa hoi. hieu va tham duc ((va hanh) or (va tinh)) dai cua viet*.