Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
nam qua » nam quan, nam cua, nam mua
qua ban » cua ban, qua quan
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ma hoi. hieu van nam qua ban thanh vai ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. hieu van nam qua ban thanh vai ((dua tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoi. hieu van nam qua ban thanh vai ((dua tren) or (cua triet))*.