Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
danh vai » danh sai, danh va, doanh van
cau tren » cu tren, dau tren, ca tren
ky tang » ky nang, ky dang, kho tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu van
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va danh » va dinh, va dan, va hanh
ky sang » ky nang, ky dang, duy sang
vai cau » va cau, van cau, vai cac

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 sang) or (ky tang)) mai hoi. ((hieu ve) or (hieu va)) cam duc va danh vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((ky sang) OR (ky tang)) mai hoi. ((hieu ve) OR (hieu va)) cam duc va danh vai cau tren.
• Adding a wildcard symbol may retrieve word variants: thuat sach ((ky sang) or (ky tang)) mai hoi. ((hieu ve) or (hieu va)) cam duc va danh vai cau tren*.