Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
tay lang » tai lang, tay tang, tay quang
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
ty lang » ty xang, ty hang, tu lang
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
hanh va » hang va, hanh vi
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ty lang) or (tay lang)) xa hoi. hieu ve pham thuc van hanh va cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty lang) OR (tay lang)) xa hoi. hieu ve pham thuc van hanh va cua viet.
• Adding a wildcard symbol may retrieve word variants: te sach ((ty lang) or (tay lang)) xa hoi. hieu ve pham thuc van hanh va cua viet*.