Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
xay hanh » day nhanh, day thanh, xanh hanh
kho tang » cao tang
thuc xay » thuc day, tuc xay, thuat xay
tai cuu » tai cuc, tai cua, thai cua
ky tang » ky nang, ky dang, ky trong
va nam » van nam, ha nam, va nay
ma hoi » mai hoi, xa hoi, ma hoa
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ((ky tang) OR (kho tang)) ma hoi. lieu va nam thuc xay hanh ((tai cuu) or (tai buu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ((ky tang) OR (kho tang)) ma hoi. lieu va nam thuc xay hanh ((tai cuu) OR (tai buu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ((ky tang) OR (kho tang)) ma hoi. lieu va nam thuc xay hanh ((tai cuu) or (tai buu)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ((ky tang) OR (kho tang)) ma hoi. lieu va nam thuc xay hanh ((tai cuu) or (tai buu)) tre*.