Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
cua triet » cua viet, su triet, va triet
doanh va » doanh tai, doanh cua, hanh va
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va cham » va chat, va tham
cua tre » cua te, cuu tre, dua tren
su can » su van, su cao, tu can
o lang » hoa lang, hoi lang
can o » can bo, can ho, chan o

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

• Performing a fuzzy search may retrieve terms with similar spellings: su can o lang xa hoi. hieu va cham thuc vat ((doanh va) OR (doan va)) ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su can o lang xa hoi. hieu va cham thuc vat ((doanh va) OR (doan va)) ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su can o lang xa hoi. hieu va cham thuc vat ((doanh va) OR (doan va)) ((cua tre) or (cua triet))*".