Perhaps you should try some spelling variations:
cham xuc » cam xuc, chat xuc, cham soc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
hieu va » lieu va, hieu qua
hieu su » hieu sau, tieu su, hieu so
dan tai » van tai, dan thi, han tai
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
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 sang ma hoi. ((hieu va) or (hieu su)) cham xuc va dan tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang ma hoi. ((hieu va) OR (hieu su)) cham xuc va dan tai va thiet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang ma hoi. ((hieu va) or (hieu su)) cham xuc va dan tai va thiet*.