Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cua triet » cua viet, su triet, va triet
sach han » sach tham, sach danh, sach nang
han nang » phan nang, van nang, ban nang
nang mai » nang ma, nang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
sinh dai » sinh thai, si dai, sinh vat
te sach » toc sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va sinh » va kinh, va tinh, vi sinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach han nang mai khoi. ((hieu ve) or (hieu va)) nham thuc va sinh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach han nang mai khoi. ((hieu ve) OR (hieu va)) nham thuc va sinh dai cua triet.
• Adding a wildcard symbol may retrieve word variants: te sach han nang mai khoi. ((hieu ve) or (hieu va)) nham thuc va sinh dai cua triet*.