Perhaps you should try some spelling variations:
dan khanh » dang khanh, van khanh, dat khanh
can hanh » ban hanh, van hanh, dan hanh
vu sach » vu bach, su sach, vu khach
va cham » va chat, va tham
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
vi cua » vai cua, di cua
cua cu » cua chu, cua cau, cua su

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 soc ((can hanh) or (dan khanh)) vi cua cu~.
• 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 soc ((can hanh) OR (dan khanh)) vi cua cu.
• Adding a wildcard symbol may retrieve word variants: vu sach y ((nang xa) or (nang ma)) hoi. lieu va cham soc ((can hanh) or (dan khanh)) vi cua cu*.