Perhaps you should try some spelling variations:
thien van » thi van
nam thuc » nam thuoc, nam thu, nam tu
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky nang x ho. ((hieu ve) or (thien van)) ((nam thuc) or (am thuc)) va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky nang x ho. ((hieu ve) OR (thien van)) ((nam thuc) OR (am thuc)) va hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: su xac ky nang x ho. ((hieu ve) or (thien van)) ((nam thuc) or (am thuc)) va hanh vi cuu tre*.