Perhaps you should try some spelling variations:
khanh lai » khanh luan, thanh lap, thanh loi
cua viet » ca viet, hoa viet, cua vat
va khanh » van khanh, va thanh, vu khanh
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
sang tao » hang tai
lai cua » dai cua, hai cua, lai chau
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach
nang ma » tang ma, sang ma, nang cao
vu sach » vu bach, vu khach

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) or (vu sach)) y ((nang ma) or (sang tao)) hoa. hieu van nam thuc va khanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y ((nang ma) OR (sang tao)) hoa. hieu van nam thuc va khanh lai cua viet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y ((nang ma) or (sang tao)) hoa. hieu van nam thuc va khanh lai cua viet*.