Perhaps you should try some spelling variations:
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
tinh ca » tinh cao, tinh cua, tinh va
tu can » tu ban, tu cac, thu canh
cua te » cua tu
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » truc va, tuc xa, duc va
can ky » van ky, dan ky, ban ky
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu can ky nang ma hoi. hieu va cac ((tuc va) or (thuc va)) tinh ca ((cua te) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu can ky nang ma hoi. hieu va cac ((tuc va) OR (thuc va)) tinh ca ((cua te) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: tu can ky nang ma hoi. hieu va cac ((tuc va) or (thuc va)) tinh ca ((cua te) or (va thiet))*.