Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
dang xay » dang van, van xay
vu sach » vu bach, su sach, vu khach
xuc van » duc van, luc van, vuc van
cao xuc » cam xuc, cao duc, cao suc
hieu va » lieu va, hieu qua
luu tre » luu tru, cuu tre, luy tre
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
va cao » va cac, va co, va dao
vi luu » vi lua

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 ma) or (dang xay))) or (sang ma)) hoi. hieu va cao xuc van hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y ((((nang ma) OR (dang xay))) OR (sang ma)) hoi. hieu va cao xuc van hanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: vu sach y ((((nang ma) or (dang xay))) or (sang ma)) hoi. hieu va cao xuc van hanh vi luu tre*.