Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
nang mai » nang ma, nang tai, lang mai
cam thuc » am thuc, nam thuc, can thuc
va triet » va trien, ve triet, cua triet
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
cam thu » nam thu, cac thu, ca thu
y nang » ky nang, ly nang, v nang
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 y nang mai hoi. hieu ve ((cam thuc) or (cam thu)) gia thanh vai ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang mai hoi. hieu ve ((cam thuc) OR (cam thu)) gia thanh vai ((va triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: su sach y nang mai hoi. hieu ve ((cam thuc) or (cam thu)) gia thanh vai ((va triet) or (va thiet))*.