Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, hieu ve
cham xuc » cam xuc, chat xuc, cham soc
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
han tai » hang tai, nhan tai, toan tai
van tai » von tai, van tuan
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, luc 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: thu sach ky nang ma hoi. ((hieu van) OR (lieu va)) cham xuc va ((han tai) or (van tai)) va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ma hoi. ((hieu van) OR (lieu va)) cham xuc va ((han tai) OR (van tai)) va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ma hoi. ((hieu van) OR (lieu va)) cham xuc va ((han tai) or (van tai)) va thiet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ma hoi. ((hieu van) OR (lieu va)) cham xuc va ((han tai) or (van tai)) va thiet*.