Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
hang tai » hang va, dung tai
tham tuc » thai tuc, nham thuc, pham thuc
cuu tre » cau tren, cau treo
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cua tre » cua te, cua triet, dua tren
va hang » van hang, va nang, va lang
te sac » te sach, te cac, te san
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: te sac ky lang xa hoi. hieu va ((tham tuc) OR (tham thuc)) va hang tai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang xa hoi. hieu va ((tham tuc) OR (tham thuc)) va hang tai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky lang xa hoi. hieu va ((tham tuc) OR (tham thuc)) va hang tai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sac ky lang xa hoi. hieu va ((tham tuc) OR (tham thuc)) va hang tai ((cua tre) or (cuu tre))*.