Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh viet » anh viet, danh viet, han viet
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
ca truc » cau truc, dai truc, nam truc
ba truc » cau truc, ba trung, dai truc
va hanh » van hanh, va thanh, ban hanh
viet a » viet ha, viet ca, viet o
a tro » va tro, a two

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 ky lang xa hoi. hieu qua ((((ca truc) or (ba truc))) or (ca tru)) va hanh viet a tro~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky lang xa hoi. hieu qua ((((ca truc) OR (ba truc))) OR (ca tru)) va hanh viet a tro.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky lang xa hoi. hieu qua ((((ca truc) or (ba truc))) or (ca tru)) va hanh viet a tro*.