Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
hang di » hang doi, hang vi, hang dien
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
thu va » thue va, tu va, thu ha
di cua » dai cua, doi cua, de cua

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