Perhaps you should try some spelling variations:
khoai lang » hoa lang, hoi lang, khoa dang
khoa mang » khoa dang, khoa mong, kho tang
may hoi » may thoi, tay hoi, mai hoi
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
luu tre » luu tru, cuu tre, luy tre
tu dac » thu dac, tu cac, tu dat
soc va » hoc va, loc va, doc va
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu dac ((khoa mang) OR (khoai lang)) may hoi. hieu va cham soc va hanh vi luu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu dac ((khoa mang) OR (khoai lang)) may hoi. hieu va cham soc va hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: tu dac ((khoa mang) OR (khoai lang)) may hoi. hieu va cham soc va hanh vi luu tre*.