Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thu sach » tu sach, thuoc sach, thu hoach
hanh vai » hanh vi, hanh va, hanh tai
cau tren » cu tren, dau tren, ca tren
ky tang » ky nang, ky dang, kho tang
ky sang » ky nang, ky dang, duy sang
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
vai cau » va cau, van cau, vai cac
mai hoi » mai khoi, dai hoi, lai hoi
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (thuat sach)) ((ky sang) or (ky tang)) mai hoi. hieu ve cam xuc va hanh vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) ((ky sang) OR (ky tang)) mai hoi. hieu ve cam xuc va hanh vai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuat sach)) ((ky sang) or (ky tang)) mai hoi. hieu ve cam xuc va hanh vai cau tren".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuat sach)) ((ky sang) or (ky tang)) mai hoi. hieu ve cam xuc va hanh vai cau tren*.