Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh van » thanh san, thanh toan, thanh phan
hieu van » hieu va, thien van, lieu va
dau tren » dau tien, dat tren, dau tieng
tu sach » thu sach, su sach, te sach
van lam » van nam
van dau » van dao, phan dau
lam tu » nam tu, cam tu, dam tu
tu gia » tu giao, tu giac, tu giay
x hoi » o hoi, x ho, 5 hoi

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) or (thuat sach)) ky nang ((x hoi) OR (xa hoi)). hieu van lam tu gia thanh van dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky nang ((x hoi) OR (xa hoi)). hieu van lam tu gia thanh van dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat sach)) ky nang ((x hoi) OR (xa hoi)). hieu van lam tu gia thanh van dau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ky nang ((x hoi) OR (xa hoi)). hieu van lam tu gia thanh van dau tren*.