Perhaps you should try some spelling variations:
voi hoat » toi hoat, doi hoat, vo hoat
cam tuc » cam xuc, cam tu, nam thuc
va kinh » va tinh, qua kinh
va danh » va dinh, va dan, va hanh
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
vi hoa » voi hoa, vi hoc, va hoa
so sac » so sach, so dac

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky nang ma hoi. hieu va cam tuc ((va danh) or (va kinh)) ((vi hoa) or (voi hoat)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky nang ma hoi. hieu va cam tuc ((va danh) OR (va kinh)) ((vi hoa) OR (voi hoat)) viet.
• Adding a wildcard symbol may retrieve word variants: so sac ky nang ma hoi. hieu va cam tuc ((va danh) or (va kinh)) ((vi hoa) or (voi hoat)) viet*.