Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dang hai » dang khai, hang hai, dung hai
cau tren » cu tren, dau tren, ca tren
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
xuc ban » duc ban, cuc ban, quoc ban
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, te sach
hai cau » hai chau, hai chu, hai hau
hieu va » lieu va, hieu qua
ha hoi » hoa hoi, ha noi, xa hoi
va lam » van lam, va lap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuat sach) or (tu sach)) ky lang ha hoi. hieu va lam ((xuc ban) or (duc van)) dang hai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (tu sach)) ky lang ha hoi. hieu va lam ((xuc ban) OR (duc van)) dang hai cau tren.
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (tu sach)) ky lang ha hoi. hieu va lam ((xuc ban) or (duc van)) dang hai cau tren*.