Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
cham thuc » nham thuc, pham thuc, tham thuc
va triet » va thiet, va trien, ve triet
thi hang » thi hanh, thi nang, thi hong
hanh tai » thanh tai, hang tai, han tai
sach thi » sach thu, sach tai, sach thieu
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
ca hoi » cau hoi, cua hoi, co hoi

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