Perhaps you should try some spelling variations:
dung sang » dung san, dung dang, dung nang
sang tao » hang tai
cham luc » cham soc, nhan luc, cham cuu
ban phan » van phan, ban than, ban nhan
te sach » toc sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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 dung sang tao boi. hieu va cham luc ((ban phan) or (ban phap)) lap ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach dung sang tao boi. hieu va cham luc ((ban phan) OR (ban phap)) lap ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: te sach dung sang tao boi. hieu va cham luc ((ban phan) or (ban phap)) lap ((cua tre) or (cua te))*.