Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
vuc nang » cuc nang, vu nang, chuc nang
cac thuc » cach thuc, cac thu, can thuc
va thanh » gia thanh, ban thanh, va tinh
thanh do » thanh de, thanh pho, thanh hoa
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
do va » do van, so va
thiet » thieu

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)) vuc nang ma hoi. hieu ve cac thuc va thanh do va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu khach)) vuc nang ma hoi. hieu ve cac thuc va thanh do va thiet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) vuc nang ma hoi. hieu ve cac thuc va thanh do va thiet*.