Perhaps you should try some spelling variations:
sua triet » su triet, cua triet, sua tiet
sach thu » sach thue, sach thieu, sach tham
thu hang » thi hang, thuc hanh, thu huong
hieu cac » hieu luc, hieu va, hieu van
cac chat » cao chat, cac thuat, cac nha
thuc dan » thuc hanh, hoc dan, thuc vat
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc day
dai sua » dai cua
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 thu hang va hoi. hieu cac chat ((thuc va) or (thuc dan)) hanh dai sua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu hang va hoi. hieu cac chat ((thuc va) OR (thuc dan)) hanh dai sua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach thu hang va hoi. hieu cac chat ((thuc va) or (thuc dan)) hanh dai sua triet*.