Perhaps you should try some spelling variations:
cam thuc » am thuc, cam thu, can thuc
nam thuc » nam thuoc, am thuc, nam thu
dan hanh » dang hanh, dan khanh, dan thanh
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
doi cua » dai cua, hoi cua, dong cua
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky lang xa hoi. hieu ve ((cam thuc) OR (nam thuc)) dan hanh ((vi cua) OR (doi cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky lang xa hoi. hieu ve ((cam thuc) OR (nam thuc)) dan hanh ((vi cua) or (doi cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: su sac ky lang xa hoi. hieu ve ((cam thuc) OR (nam thuc)) dan hanh ((vi cua) or (doi cua)) tre*.