Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
tham thuc » nham thuc, pham thuc, tam thuc
va triet » va thiet, va trien, ve triet
sach thi » sach thu, sach thieu, sach tham
va thanh » gia thanh, ban thanh, va tinh
sach tai » sach bai, sach tham, sach dao
cua hoi » cua moi
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thuat
thuc va » thuc vat, thuc dan, thuc day
tai va » thai va, mai va, tri va

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 thi) OR (sach tai)) hang ((cua hoi) or (xa hoi)). hieu va tham thuc va thanh tai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thi) OR (sach tai)) hang ((cua hoi) OR (xa hoi)). hieu va tham thuc va thanh tai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thi) OR (sach tai)) hang ((cua hoi) or (xa hoi)). hieu va tham thuc va thanh tai va triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thi) OR (sach tai)) hang ((cua hoi) or (xa hoi)). hieu va tham thuc va thanh tai va triet*.