Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
toc sach » hoc sach, doc sach, thuoc sach
tu cach » tu cac
duc van » duc va, duc tan, duc manh
ve phat » va phat, te phat, de phat
ve phan » va phan, ke phan, vi phan
hang ca » hang va, nang cao, hang tai
tu hang » thu hang, tu hanh, tu hung
cuu tre » cua tre, cau tren, cau treo
ca hoi » cau hoi, cua hoi, xa hoi
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: ((tu cach) or (toc sach)) tu hang ca hoi. hieu ((ve phan) or (ve phat)) duc van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (toc sach)) tu hang ca hoi. hieu ((ve phan) OR (ve phat)) duc van hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (toc sach)) tu hang ca hoi. hieu ((ve phan) or (ve phat)) duc van hanh vi cuu tre*.