Perhaps you should try some spelling variations:
hai chi » thai chi, tai chi, hai thi
hai chu » hai chau, hoi chu, hai phu
sach ky » sac ky, sach y, sach ty
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va
cam tuc » cam xuc, cam tu, nam thuc
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang ma hoi. ((hieu va) or (hieu qua)) cam tuc va dan ((hai chu) OR (hai chi)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ma hoi. ((hieu va) OR (hieu qua)) cam tuc va dan ((hai chu) OR (hai chi)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang ma hoi. ((hieu va) or (hieu qua)) cam tuc va dan ((hai chu) OR (hai chi)) treo".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ma hoi. ((hieu va) or (hieu qua)) cam tuc va dan ((hai chu) OR (hai chi)) treo*.