Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
pham thuc » phap thuc, pham chuc, nham thuc
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
vat hanh » van hanh, va hanh, nhat hanh
van pham » san pham, van phan, van phat
nang xa » nang x, lang xa, nang ma
so sanh » do sanh
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di 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 (cho sinh)) y nang xa hoi. hieu van pham thuc ((vat hanh) OR (vat thanh)) vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sanh) OR (cho sinh)) y nang xa hoi. hieu van pham thuc ((vat hanh) OR (vat thanh)) vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sanh) or (cho sinh)) y nang xa hoi. hieu van pham thuc ((vat hanh) OR (vat thanh)) vi cua viet".
• Adding a wildcard symbol may retrieve word variants: ((so sanh) or (cho sinh)) y nang xa hoi. hieu van pham thuc ((vat hanh) OR (vat thanh)) vi cua viet*.