Perhaps you should try some spelling variations:
sach thuc » cach thuc, sach thu, sach thue
chat truc » cau truc, chat xuc
hanh dai » hanh tai, hanh dao, vanh dai
su triet » su viet, su tien
ve triet » va trien
tu sach » thu sach, su sach, te sach
hanh va » hang va, hanh vi
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
va hoi » xa hoi, va hoc, va hoa

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 thuc hanh va hoi. hieu va chat truc va hanh dai ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thuc hanh va hoi. hieu va chat truc va hanh dai ((su triet) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach thuc hanh va hoi. hieu va chat truc va hanh dai ((su triet) or (ve triet))*.