Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
sach thi » sach thu, sach tai, sach thieu
thi hang » thi hanh, thi nang, thi hong
danh tai » doanh tai, dinh tai, hanh tai
ve triet » va trien, su triet
te sach » toc sach
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
ca hoi » cau hoi, cua hoi, co hoi
tai ve » tai va, tai he, tai le

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 thi hang ((ca hoi) or (xa hoi)). hieu va tham thuc va danh tai ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thi hang ((ca hoi) OR (xa hoi)). hieu va tham thuc va danh tai ve triet.
• Adding a wildcard symbol may retrieve word variants: te sach thi hang ((ca hoi) or (xa hoi)). hieu va tham thuc va danh tai ve triet*.