Perhaps you should try some spelling variations:
cham luoc » khai luoc, kham cuoc, tham nuoc
van hanh » van thanh, ban hanh, van anh
vu sach » vu bach, su sach, vu khach
hanh di » hanh vi, hanh de, hang di
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y ((lang xa) OR (nang ma)) hoi. lieu va ((cham luoc) OR (cham soc)) van hanh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y ((lang xa) or (nang ma)) hoi. lieu va ((cham luoc) OR (cham soc)) van hanh di cua tre~".
• Adding a wildcard symbol may retrieve word variants: vu sach y ((lang xa) or (nang ma)) hoi. lieu va ((cham luoc) OR (cham soc)) van hanh di cua tre*.