Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
vu cham » va cham, vu kham, tu cham
hanh di » hanh vi, hanh de, hang di
luc van » luoc van, luu van, duc van
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu khach)) ky tang ma hoi. hieu ((ve cam) or (vu cham)) luc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu khach)) ky tang ma hoi. hieu ((ve cam) OR (vu cham)) luc van hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) ky tang ma hoi. hieu ((ve cam) or (vu cham)) luc van hanh di cua tre*.