Perhaps you should try some spelling variations:
thuc van » thuc vat, thuc va, thuc hanh
thuc dan » thuc hanh, hoc dan, thuc vat
tuan doi » truan doi, quan doi, luan doi
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
ve nam » he nam, va nam, le nam

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 y) or (sac ky)) nang ma hoa. hieu ve nam ((thuc van) OR (thuc dan)) tuan doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (sac ky)) nang ma hoa. hieu ve nam ((thuc van) OR (thuc dan)) tuan doi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach y) or (sac ky)) nang ma hoa. hieu ve nam ((thuc van) OR (thuc dan)) tuan doi cua tre*".