Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
nam thuc » nam thuoc, am thuc, nam thu
te sach » toc sach
cam tuc » cam xuc, cam tu, dam thuc
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
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: te sach y ((nang ma) or (nang x)) hoi. hieu ve ((cam tuc) or (nam thuc)) van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang ma) OR (nang x)) hoi. hieu ve ((cam tuc) OR (nam thuc)) van hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang ma) or (nang x)) hoi. hieu ve ((cam tuc) or (nam thuc)) van hanh vi cuu tre*.