Perhaps you should try some spelling variations:
khanh hoa » thanh hoa, hang hoa
dan khanh » dang khanh, van khanh, dat khanh
hieu van » hieu va, thien van, lieu va
thuc dan » thuc hanh, hoc dan, thuc vat
so sach » so sanh, bo sach, co sach
lang xa » lang ha, dang xay, lang van
nang ma » tang ma, sang ma, nang cao
hoa huu » hoc huu
huu tre » huu tri, cuu tre, huu them
van am » van nam, van lam, van dam

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y ((lang xa) or (nang ma)) hoi. hieu van am thuc dan khanh hoa huu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((lang xa) OR (nang ma)) hoi. hieu van am thuc dan khanh hoa huu tre*.