Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cham tuc » nham thuc, pham thuc, cham soc
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, kho tang
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, me hoi
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi cuu » vi luu, vinh cuu
tu sac » tu sach, tu cac, tu san

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