Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
vat hanh » vat thanh, van hanh, va hanh
cua viet » ca viet, hoa viet, cua vat
nang ma » tang ma, sang ma, nang cao
hanh di » hanh vi, hanh de, hang di
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua

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) or (do sanh))) or (cho sinh)) y nang ma hoi. hieu van pham thuc vat hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((so sanh) OR (do sanh))) OR (cho sinh)) y nang ma hoi. hieu van pham thuc vat hanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: ((((so sanh) or (do sanh))) or (cho sinh)) y nang ma hoi. hieu van pham thuc vat hanh di cua viet*.