Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
ban hang » ngan hang
hang vi » hang va, hanh vi, hang di
cao duc » dao duc, cao suc, giao duc
cam duc » cam xuc, pham duc, nam duoc
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
vi cua » vai cua, di cua
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y ((nang xa) OR (nang ma)) hoi. lieu va ((cam duc) OR (cao duc)) ban hang vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y ((nang xa) or (nang ma)) hoi. lieu va ((cam duc) OR (cao duc)) ban hang vi cua te~".
• Adding a wildcard symbol may retrieve word variants: thuat sach y ((nang xa) or (nang ma)) hoi. lieu va ((cam duc) OR (cao duc)) ban hang vi cua te*.