Perhaps you should try some spelling variations:
sach dao » lanh dao
thuc hay » thuc day, thuc xay, thuc hanh
tang mai » tang ma, tang tai, lang mai
xanh di » danh di, vanh dai, xanh tai
thuc ha » thu ha, thuc va, thuc hanh
va nham » va cham, va tham, va nha
mai hoi » mai khoi, dai hoi, lai hoi
sach ha » sach nha, sach han, sach xa
di cua » dai cua, doi cua, de cua
cua su » qua su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach dao) or (sach ha)) tang mai hoi. lieu va nham ((thuc ha) or (thuc hay)) xanh di cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach dao) OR (sach ha)) tang mai hoi. lieu va nham ((thuc ha) OR (thuc hay)) xanh di cua su.
• Adding a wildcard symbol may retrieve word variants: su ((sach dao) or (sach ha)) tang mai hoi. lieu va nham ((thuc ha) or (thuc hay)) xanh di cua su*.