Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh dai » hanh tai, hanh dao, vanh dai
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, mang may
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
so viet » hoc viet
va cam » va cac, va cao, va cai
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: thuat sach ky ((nang ma) or (nang cao)) hoi. lieu ((va cam) OR (va cham)) xuc va hanh dai so viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((nang ma) OR (nang cao)) hoi. lieu ((va cam) OR (va cham)) xuc va hanh dai so viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky ((nang ma) or (nang cao)) hoi. lieu ((va cam) OR (va cham)) xuc va hanh dai so viet".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang ma) or (nang cao)) hoi. lieu ((va cam) OR (va cham)) xuc va hanh dai so viet*.