Perhaps you should try some spelling variations:
thanh vien » nhan vien, thanh van
cham thuc » nham thuc, pham thuc, tham thuc
cua viet » ca viet, hoa viet, cua vat
thanh ve » hanh ve, thanh va, thanh van
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
tang ha » lang ha, tang ma, trung ha
xang ha » lang ha, dang ha, hang ha
ve cham » va cham, ve chat, vu cham

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 ((xang ha) or (tang ha)) hoi. hieu ve cham thuc va ((thanh ve) OR (thanh vien)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((xang ha) OR (tang ha)) hoi. hieu ve cham thuc va ((thanh ve) OR (thanh vien)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((xang ha) or (tang ha)) hoi. hieu ve cham thuc va ((thanh ve) OR (thanh vien)) cua viet".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((xang ha) or (tang ha)) hoi. hieu ve cham thuc va ((thanh ve) OR (thanh vien)) cua viet*.