Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
thuc ban » thuoc ban, thuc dan, thu ban
hanh tai » thanh tai, han tai, hinh tai
hang tai » hang va, dung tai
su triet » su viet, su tien, ve triet
ky mang » ky nang, ke mang, ky dang
may hoi » may thoi, tay hoi, mai hoi
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky mang may hoi. hieu va tham thuc ban ((hanh tai) OR (hang tai)) su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky mang may hoi. hieu va tham thuc ban ((hanh tai) OR (hang tai)) su triet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky mang may hoi. hieu va tham thuc ban ((hanh tai) OR (hang tai)) su triet*.