Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan
chua tre » chua tri, chua trieu, cho tre
danh va » doanh va, hanh va, anh va
cua tre » cua te, cuu tre, cua triet
va nham » va cham, va tham, va nha
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
o lang » hoa lang, hoi lang
su cac » tu cac, su cao, su can
cac o » cac co, cac bo, cac ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cac o lang xa hoi. hieu va nham ((thuc dan) OR (thuc vat)) danh va ((chua tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac o lang xa hoi. hieu va nham ((thuc dan) OR (thuc vat)) danh va ((chua tre) OR (cua tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cac o lang xa hoi. hieu va nham ((thuc dan) OR (thuc vat)) danh va ((chua tre) or (cua tre))*".