Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
phap thuc » phap thu, phap hoc, phap tu
thanh vi » hanh vi, thanh va, thanh ve
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
vi cua » vai cua, di cua
cai ky » cao ky, cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
cam ky » cao ky, cac ky
cua te » cua tu

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: tu ((cai ky) OR (cam ky)) nang ma hoi. hieu ve ((phap thuc) OR (tham thuc)) gia thanh vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((cai ky) OR (cam ky)) nang ma hoi. hieu ve ((phap thuc) or (tham thuc)) gia thanh vi cua te~".
• Adding a wildcard symbol may retrieve word variants: tu ((cai ky) OR (cam ky)) nang ma hoi. hieu ve ((phap thuc) or (tham thuc)) gia thanh vi cua te*.