Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
vu sach » vu bach, su sach, vu khach
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
luc van » luoc van, luu van, duc van
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » vien cac
vi cuu » vi luu, vinh cuu

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

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