Perhaps you should try some spelling variations:
thu sac » thu sach, thu san, thu xac
hieu va » lieu va, hieu qua
cac lao » ca lao, cac loai, cac giao
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cua tre » cuu tre, cua triet, dua tren
sac ky » cac ky, sai ky
cua te » cua tu
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 ky nang x hoi. hieu va cac lao ((va danh) OR (va hanh)) vai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang x hoi. hieu va cac lao ((va danh) OR (va hanh)) vai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky nang x hoi. hieu va cac lao ((va danh) OR (va hanh)) vai ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang x hoi. hieu va cac lao ((va danh) OR (va hanh)) vai ((cua tre) or (cua te))*.