Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
nang ma » tang ma, sang ma, nang cao
va dan » ca dan, va dao, va dap
va dau » va dao
vi cua » vai cua, di cua
cua te » cua tu

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 hoa. ((hieu ve) or (hieu van)) cam xuc ((va dan) OR (va dau)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang ma hoa. ((hieu ve) OR (hieu van)) cam xuc ((va dan) OR (va dau)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang ma hoa. ((hieu ve) or (hieu van)) cam xuc ((va dan) OR (va dau)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ma hoa. ((hieu ve) or (hieu van)) cam xuc ((va dan) OR (va dau)) vi cua te*.