Perhaps you should try some spelling variations:
khai duoc » khai luoc, khoan duoc, hai huoc
nang mai » nang ma, nang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
hanh dau » danh dau, han dau, hanh mau
hang dau » hang va, hang tai
su triet » su viet, su tien, ve triet
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va khai » van khai, va khao, va kha
duoc va » nuoc va, duc va, duoc ma

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang mai khoi. hieu va khai duoc va ((hanh dau) or (hang dau)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang mai khoi. hieu va khai duoc va ((hanh dau) OR (hang dau)) su triet.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang mai khoi. hieu va khai duoc va ((hanh dau) or (hang dau)) su triet*.