Perhaps you should try some spelling variations:
hoan thanh » hoang thanh, ban thanh, van thanh
danh gian » dan gian, danh gia, danh giao
sach moi » sach doi, sach hoi, bach mai
hoc phan » hoc dan, hoc pho
hoc danh » hoc dan, hoc anh, hoc hanh
gian dan » gian lang
tu sach » thu sach, su sach, te sach
moi tai » hoi tai, mo tai, moi thoi
cuu mot » cua mot, cuu mo, huu mot
ma hoc » va hoc, ma hoa, mo hoc

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 moi tai, nghien cuu mot ((hoc phan) or (hoan thanh)) hoa hoc ma hoc danh gian dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach moi tai, nghien cuu mot ((hoc phan) OR (hoan thanh)) hoa hoc ma hoc danh gian dan.
• Adding a wildcard symbol may retrieve word variants: tu sach moi tai, nghien cuu mot ((hoc phan) or (hoan thanh)) hoa hoc ma hoc danh gian dan*.