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 dieu
trung ha » trung hoc, trung tam, trung cap
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
sach ty » sach y, sach tu, sach thu
xang ha » lang ha, tang ha, dang ha

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