Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
qua pham » quan pham, quy pham, qua cham
sanh ty » sach ty, canh tay
nang ma » tang ma, sang ma, mang may
so sanh » do sanh
dai va » mai va
doi va » hoi va, noi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh ty ((nang ma) OR (nang cao)) hoi. hieu qua pham thuc van hanh ((dai va) or (doi va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ty ((nang ma) OR (nang cao)) hoi. hieu qua pham thuc van hanh ((dai va) OR (doi va)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ty ((nang ma) OR (nang cao)) hoi. hieu qua pham thuc van hanh ((dai va) or (doi va)) triet*".