Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
hanh dai » hanh tai, hanh dao, vanh dai
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
ve cam » ve cham, ve cac, va cam
tuc va » truc va, tuc xa, duc va
dai va » mai va

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 ky nang mai hoi. hieu ve cam ((tuc va) or (thuc va)) hanh dai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang mai hoi. hieu ve cam ((tuc va) OR (thuc va)) hanh dai va triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang mai hoi. hieu ve cam ((tuc va) or (thuc va)) hanh dai va triet*.