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 tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
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 ca » viet ha, viet co, viet a
ca tro » cac tro, va tro, ca tra

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