Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van thanh » van tuan
hieu van » hieu va, thien van, lieu va
van cam » van nam, van lam, van cau
hai cua » thai cua, dai cua, hoi cua
tu sach » thu sach, te sach, tu cach
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) ky tang ma hoi. hieu van cam xuc ((van thanh) OR (ban thanh)) hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky tang ma hoi. hieu van cam xuc ((van thanh) OR (ban thanh)) hai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky tang ma hoi. hieu van cam xuc ((van thanh) OR (ban thanh)) hai cua tu".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky tang ma hoi. hieu van cam xuc ((van thanh) OR (ban thanh)) hai cua tu*.