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

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 va ((hanh va) OR (hang 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 va ((hanh va) OR (hang va)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty lang) or (tay lang)) xa hoi. hieu ve pham thuc va ((hanh va) OR (hang va)) cua viet".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty lang) or (tay lang)) xa hoi. hieu ve pham thuc va ((hanh va) OR (hang va)) cua viet*.