Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nham thuc » nhan thuc, nam thuc, nham thu
vanh dai » van dai, vanh tai, lanh dao
dang xay » dang van, van xay
cua tre » cua te, cuu tre, dua tren
va vanh » va van, va danh, va hanh
thuc va » thuc vat, thuc dan, thuc day
va nham » va cham, va tham, va nha
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach y) or (sac ky)) dang xay hoi. hieu va nham thuc va vanh dai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sac ky)) dang xay hoi. hieu va nham thuc va vanh dai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach y) or (sac ky)) dang xay hoi. hieu va nham thuc va vanh dai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sac ky)) dang xay hoi. hieu va nham thuc va vanh dai ((cua tre) OR (cua triet))*.