Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cau treo » cau theo, cau tren, cau triet
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
va cham » va chat, va tham
hanh di » hanh vi, hanh de, hang di
cham o » cham soc
di cau » da cau, diem cau
o van » vo van, so van, do van

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y ((nang xa) or (nang ma)) hoi. lieu va cham o van hanh di cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y ((nang xa) OR (nang ma)) hoi. lieu va cham o van hanh di cau treo.
• Adding a wildcard symbol may retrieve word variants: vu sach y ((nang xa) or (nang ma)) hoi. lieu va cham o van hanh di cau treo*.