Perhaps you should try some spelling variations:
can hanh » ban hanh, van hanh, dan hanh
luoc can » luc canh, hoc can, luoc dai
vu sach » vu bach, su sach, vu khach
va chat » van chat, va phat, cao chat
va cham » 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 tu » cua tuc, cua su, cua cu

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) OR (va chat)) luoc can hanh vi cua tu~.
• 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) OR (va chat)) luoc can hanh vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y ((nang xa) or (nang ma)) hoi. lieu ((va cham) OR (va chat)) luoc can hanh vi cua tu".
• Adding a wildcard symbol may retrieve word variants: vu sach y ((nang xa) or (nang ma)) hoi. lieu ((va cham) OR (va chat)) luoc can hanh vi cua tu*.