Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
dang tao » sang tao, nang tao, vang tao
hanh hai » thanh hai, nhanh hai, hang hai
ban hanh » ban hang
hieu van » thien van, lieu va, hieu ve
ky dang » ky nang, ky danh
tao hoi » tao khoi, tao boi, tay hoi
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
so sach » so sanh, bo sach, co sach
vu sach » vu bach, su sach, vu khach
hai su » hai vu, lai su, hai so

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) or (so sach)) ky dang tao hoi. ((hieu van) or (hieu va)) cac duc ban hanh hai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sach)) ky dang tao hoi. ((hieu van) OR (hieu va)) cac duc ban hanh hai su triet.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sach)) ky dang tao hoi. ((hieu van) or (hieu va)) cac duc ban hanh hai su triet*.