Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam tu
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu
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: vu sach ky nang x hoi. hieu van ((nam thuc) or (nam thu)) va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. hieu van ((nam thuc) OR (nam thu)) va hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu van ((nam thuc) or (nam thu)) va hanh vi cuu tre*.