Perhaps you should try some spelling variations:
van chat » cao chat
van hanh » van thanh, ban hanh, van anh
vu sach » vu bach, vu khach
va chua » vua chua, ca chua, va chu
hanh va » hang va, hanh vi
hoc van » hoc dan, hoc va, hoc vat
va chat » va phat, cao chat, hoa chat
nang ma » tang ma, sang ma, nang cao
su sach » so sach
chua te » cua te, chua tu, chua xe
ma hoi » mai hoi, xa hoi, ma hoa

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) OR (su sach)) ky nang ma hoi. lieu ((va chat) or (van chat)) hoc van hanh va chua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky nang ma hoi. lieu ((va chat) OR (van chat)) hoc van hanh va chua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (su sach)) ky nang ma hoi. lieu ((va chat) or (van chat)) hoc van hanh va chua te".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (su sach)) ky nang ma hoi. lieu ((va chat) or (van chat)) hoc van hanh va chua te*.