Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
cam duc » cao duc, pham duc, nam duoc
sach ty » sach tu, sach thu, xach tay
hang xa » hoang xa, hang va, hang ca
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: vu ((sach ty) or (sach y)) hang xa hoi. hieu van ((cam duc) OR (cam xuc)) ban thanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ty) OR (sach y)) hang xa hoi. hieu van ((cam duc) OR (cam xuc)) ban thanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ty) or (sach y)) hang xa hoi. hieu van ((cam duc) OR (cam xuc)) ban thanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: vu ((sach ty) or (sach y)) hang xa hoi. hieu van ((cam duc) OR (cam xuc)) ban thanh vi cua te*.