Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
vai cua » dai cua, hai cua, lai cua
thu sac » thu san, thu xac, thu dac
hieu va » lieu va, hieu qua
cac lop » cac hop, cac loai
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sac) OR (thu sach)) ky nang x hoi. hieu va cac lop ((va hanh) or (va thanh)) vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sac) OR (thu sach)) ky nang x hoi. hieu va cac lop ((va hanh) OR (va thanh)) vai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sac) OR (thu sach)) ky nang x hoi. hieu va cac lop ((va hanh) or (va thanh)) vai cua viet".
• Adding a wildcard symbol may retrieve word variants: ((thu sac) OR (thu sach)) ky nang x hoi. hieu va cac lop ((va hanh) or (va thanh)) vai cua viet*.