Perhaps you should try some spelling variations:
day nhanh » day thanh, duy nhanh, dac nhan
nam thuc » nam thuoc, nam thu, nam tu
nang mai » nang ma, nang tai, lang mai
va triet » va trien, ve triet, cua triet
nhanh ha » thanh hoa, thanh hai, khanh hoa
vu sach » vu bach, su sach, vu khach
sach ly » sach y, sach lo, sach ty
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ly nang » ky nang, ly hang, ly vang
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: vu sach ly nang mai hoi. hieu ve ((nam thuc) OR (am thuc)) day nhanh ha ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ly nang mai hoi. hieu ve ((nam thuc) OR (am thuc)) day nhanh ha ((va triet) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ly nang mai hoi. hieu ve ((nam thuc) OR (am thuc)) day nhanh ha ((va triet) or (va thiet))".
• Adding a wildcard symbol may retrieve word variants: vu sach ly nang mai hoi. hieu ve ((nam thuc) OR (am thuc)) day nhanh ha ((va triet) or (va thiet))*.