Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
hanh tai » thanh tai, hang tai, han tai
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
hang xa » hoang xa, hang va, lang xa
hang ca » hang va, nang cao, hang tai
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
tai su » tai so, tai tu, lai su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thieu ((hang xa) or (hang ca)) hoi. hieu va tham thuc va hanh tai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thieu ((hang xa) OR (hang ca)) hoi. hieu va tham thuc va hanh tai su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach thieu ((hang xa) or (hang ca)) hoi. hieu va tham thuc va hanh tai su triet*.