Perhaps you should try some spelling variations:
dang xay » dang van, van xay
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
sang ma » tang ma, sang tao, mang may
luu tre » luu tru, cuu tre, luy tre
nang ma » tang ma, nang cao, mang may
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
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 cam xuc va 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 cam xuc va 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 cam xuc va hanh vi luu tre*.