Perhaps you should try some spelling variations:
cham hoc » cham soc, chat hoc, cham hoi
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
thu xang » thu hang, thu bang, thu dang
te sach » toc sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
xang xa » lang xa, mang xa, ang xa
vu sach » vu bach, su sach, vu khach
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) or (vu sach)) thu xang xa hoi. hieu va cham hoc ((van hanh) or (ban hanh)) vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (vu sach)) thu xang xa hoi. hieu va cham hoc ((van hanh) OR (ban hanh)) vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu sach)) thu xang xa hoi. hieu va cham hoc ((van hanh) or (ban hanh)) vi cuu tre*.