Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
han tai » hang tai, nhan tai, van tai
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
ky tang » ky dang, kho tang, ky trong
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
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 tang) or (ky nang)) ma hoi. hieu ve cham ((xuc va) OR (tuc va)) han tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky tang) OR (ky nang)) ma hoi. hieu ve cham ((xuc va) OR (tuc va)) han tai va thiet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky tang) or (ky nang)) ma hoi. hieu ve cham ((xuc va) OR (tuc va)) han tai va thiet*".