Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
thuc dan » thuc hanh, hoc dan, thuc vat
hanh lai » hanh lam, hanh tai, thanh lap
su triet » su viet, su tien, ve triet
doc sac » doc sach, dac sac, hoc sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu vi » hieu voi, hieu va, hieu ve
thuc va » thuc vat, thuc day
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: doc sac ky nang mai hoi. hieu vi pham ((thuc va) or (thuc dan)) hanh lai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sac ky nang mai hoi. hieu vi pham ((thuc va) OR (thuc dan)) hanh lai su triet.
• Adding a wildcard symbol may retrieve word variants: doc sac ky nang mai hoi. hieu vi pham ((thuc va) or (thuc dan)) hanh lai su triet*.