Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cham xuc » chat xuc, cham soc, pham duc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
van tai » von tai, van tuan
tai va » thai va, mai va, tri va
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((nang xa) or (nang ma)) hoi. hieu van ((cham xuc) OR (cam xuc)) va van tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang ma)) hoi. hieu van ((cham xuc) OR (cam xuc)) va van tai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) or (nang ma)) hoi. hieu van ((cham xuc) OR (cam xuc)) va van tai va thiet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (nang ma)) hoi. hieu van ((cham xuc) OR (cam xuc)) va van tai va thiet*.