Perhaps you should try some spelling variations:
gian tao » gian tay, gian tam, gian tho
hieu van » hieu va, thien van, lieu va
ty gian » ty giao, ty gia, toi gian
vu sach » vu bach, vu khach
tao hoi » tao khoi, tao boi, tay hoi
van cau » van dau, van hau, van chat
cau dua » cau qua, cau cua, ca dua
dua ban » dia ban, cua ban, qua ban
ban anh » ban hanh, ban banh, ban danh
hai cua » thai cua, dai cua, lai cua
hoi cua » hoi chuc
su sach » so sach

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) or (vu sach)) ty gian tao hoi. hieu van cau dua ban anh ((hai cua) or (hoi cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ty gian tao hoi. hieu van cau dua ban anh ((hai cua) OR (hoi cua)) triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ty gian tao hoi. hieu van cau dua ban anh ((hai cua) or (hoi cua)) triet*.