Perhaps you should try some spelling variations:
tham thuc » nham thuc, tam thuc, thai thuc
pham thuc » phap thuc, pham chuc, nham thuc
va doanh » van doanh, vay doanh, va danh
cuu tre » cua tre, cau tren, cau treo
tai cuu » tai cuc, tai buu, tai cua
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
sac ky » cac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sac ky) or (sai ky)) lang xa hoi. hieu va ((tham thuc) OR (pham thuc)) va doanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (sai ky)) lang xa hoi. hieu va ((tham thuc) OR (pham thuc)) va doanh tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sac ky) or (sai ky)) lang xa hoi. hieu va ((tham thuc) OR (pham thuc)) va doanh tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: te ((sac ky) or (sai ky)) lang xa hoi. hieu va ((tham thuc) OR (pham thuc)) va doanh tai cuu tre*.