Perhaps you should try some spelling variations:
sach dao » lanh dao
van hanh » van thanh, ban hanh, van anh
hoi cua » hoi chuc
vai cua » dai cua, hai cua, lai cua
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
cam tu » cam thu, nam tu, dam tu
tu van » tu va
ve cam » ve cham, ve cac, va cam

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 dao ((nang xa) or (nang x)) hoi. hieu ve cam tu van hanh ((vai cua) or (hoi cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach dao ((nang xa) OR (nang x)) hoi. hieu ve cam tu van hanh ((vai cua) OR (hoi cua)) viet.
• Adding a wildcard symbol may retrieve word variants: vu sach dao ((nang xa) or (nang x)) hoi. hieu ve cam tu van hanh ((vai cua) or (hoi cua)) viet*.