Perhaps you should try some spelling variations:
hanh vinh » thanh vinh, khanh vinh, hanh tinh
nam thuc » nam thuoc, nam thu, nam tu
vat hanh » vat thanh, van hanh, va hanh
vinh cuu » dinh cuu, sinh cua, dinh cu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
cuu tre » cua tre, cau tren, cau treo
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: tu sach ky nang x hoi. ((hieu va) or (lieu va)) ((nam thuc) OR (am thuc)) vat hanh vinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. ((hieu va) OR (lieu va)) ((nam thuc) OR (am thuc)) vat hanh vinh cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. ((hieu va) or (lieu va)) ((nam thuc) OR (am thuc)) vat hanh vinh cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. ((hieu va) or (lieu va)) ((nam thuc) OR (am thuc)) vat hanh vinh cuu tre*.