Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
nang mai » nang ma, nang tai, lang mai
va triet » va trien, ve triet, cua triet
hanh vai » hanh va, hanh tai, hanh van
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
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
ve nam » he nam, va nam, le nam
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 ly nang mai hoi. hieu ve nam thuc va ((hanh vai) or (hanh vi)) ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang mai hoi. hieu ve nam thuc va ((hanh vai) OR (hanh vi)) ((va triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: su sach ly nang mai hoi. hieu ve nam thuc va ((hanh vai) or (hanh vi)) ((va triet) or (va thiet))*.