Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cham tuc » pham thuc, tham thuc, cham soc
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
ma hoi » mai hoi, xa hoi, ma hoa
sac ky » sai ky
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) OR (cac ky)) tang ma hoi. hieu ve ((cham tuc) or (nham thuc)) va dan vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (cac ky)) tang ma hoi. hieu ve ((cham tuc) OR (nham thuc)) va dan vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) OR (cac ky)) tang ma hoi. hieu ve ((cham tuc) or (nham thuc)) va dan vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) OR (cac ky)) tang ma hoi. hieu ve ((cham tuc) or (nham thuc)) va dan vi cuu tre*.