Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
hang lai » hang tai, hang hai, hang loi
vu cham » va cham, vu kham, tu cham
lai cua » dai cua, hai cua, lai chau
va hang » van hang, va nang, va lang
cua tre » cua te, cuu tre, cua triet
ve cham » va cham, ve chat, ve chim
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
co sach » bo sach, cuon sach, hoc sach
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 xa hoi. hieu ((ve cham) OR (vu cham)) thu va hang lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat san) OR (co sach)) ky tang xa hoi. hieu ((ve cham) OR (vu cham)) thu va hang lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat san) or (co sach)) ky tang xa hoi. hieu ((ve cham) OR (vu cham)) thu va hang lai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thuat san) or (co sach)) ky tang xa hoi. hieu ((ve cham) OR (vu cham)) thu va hang lai cua tre*.