Perhaps you should try some spelling variations:
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va cham » va chat, va tham
cuu tre » cua tre, cau tren, cau treo
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 tu ((nang ma) or (nang x)) hoi. hieu va cham soc ((van hanh) or (ban hanh)) vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu ((nang ma) OR (nang x)) hoi. hieu va cham soc ((van hanh) OR (ban hanh)) vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sach tu ((nang ma) or (nang x)) hoi. hieu va cham soc ((van hanh) or (ban hanh)) vi cuu tre*.