Perhaps you should try some spelling variations:
cac chat » cao chat, cac thuat, cac nha
hanh dao » lanh dao, thanh dat, thanh dam
thuc dan » thuc hanh, hoc dan, thuc vat
sach thu » sach thue, sach thieu, sach tham
sua tiet » suat thiet, cua triet, cua thiet
hieu cac » hieu luc, hieu va, hieu van
hang dan » hang dau, hang ban, tang dan
thu hang » thi hang, thuc hanh, thu huong
thuc va » thuc vat, thuc day
dan hoi » dan hoc, dai hoi, van hoi
dao sua » dai sua, dao cua, dao suu
tu sach » thu sach, su sach, te sach

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 dan hoi. hieu cac chat ((thuc va) or (thuc dan)) hanh dao sua tiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu hang dan hoi. hieu cac chat ((thuc va) OR (thuc dan)) hanh dao sua tiet.
• Adding a wildcard symbol may retrieve word variants: tu sach thu hang dan hoi. hieu cac chat ((thuc va) or (thuc dan)) hanh dao sua tiet*.