Perhaps you should try some spelling variations:
kho tang » cao tang
chat xuc » chat huu, cam xuc, chao xu
su sach » so sach, vu sach
va kinh » va tinh, qua kinh
va hanh » van hanh, va thanh, va danh
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, ky trong
hai hoa » thai hoa, dai hoa, lai hoa
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: su sach ((ky tang) OR (kho tang)) ma hoi. hieu ve chat xuc ((va hanh) or (va kinh)) hai hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky tang) OR (kho tang)) ma hoi. hieu ve chat xuc ((va hanh) OR (va kinh)) hai hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky tang) OR (kho tang)) ma hoi. hieu ve chat xuc ((va hanh) or (va kinh)) hai hoa viet".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky tang) OR (kho tang)) ma hoi. hieu ve chat xuc ((va hanh) or (va kinh)) hai hoa viet*.