Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
kho tang » cao tang
hang tai » hang va, dung tai
cham thu » cam thu, nham thu, pham thu
ky tang » ky nang, ky dang, ky trong
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hang » van hang, va nang, va lang
co sach » bo sach, cuon sach, hoc sach
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
thu va » thuc va, thue va, tu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuat san) or (co sach)) ((ky tang) OR (kho tang)) xa hoi. hieu ve cham thu va hang tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat san) OR (co sach)) ((ky tang) OR (kho tang)) xa hoi. hieu ve cham thu va hang tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat san) or (co sach)) ((ky tang) OR (kho tang)) xa hoi. hieu ve cham thu va hang tai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thuat san) or (co sach)) ((ky tang) OR (kho tang)) xa hoi. hieu ve cham thu va hang tai cua tre*.