Perhaps you should try some spelling variations:
khoai lang » hoa lang, hoi lang, khoa dang
khoa mang » khoa dang, khoa mong, kho tang
cham loc » cham soc, chon loc, cham o
luy tre » luyen tre
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
va cham » va chat, va tham
may hoi » may thoi, tay hoi, mai hoi
loc va » hoc va, luc va
tru » truc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ((khoa mang) OR (khoai lang)) may hoi. hieu va cham loc va hanh vi ((luy tre) or (luu tru))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ((khoa mang) OR (khoai lang)) may hoi. hieu va cham loc va hanh vi ((luy tre) OR (luu tru)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ((khoa mang) OR (khoai lang)) may hoi. hieu va cham loc va hanh vi ((luy tre) or (luu tru))".
• Adding a wildcard symbol may retrieve word variants: tu cac ((khoa mang) OR (khoai lang)) may hoi. hieu va cham loc va hanh vi ((luy tre) or (luu tru))*.