Perhaps you should try some spelling variations:
manh tuong » manh tung, manh cuong, minh tuong
tuong hoc » truong hoc, tuong ho, duong hoc
phan van » pham van, thanh van, luan van
tan phan » toan phan, than phan, van phan
sach moi » sach doi, sach hoi, bach mai
sach hoc » cach hoc, sach hoi, mach hoc
hoc manh » hoc anh, hoc hanh, hoc danh
hai tan » hai van, hai quan
tai hai » thi hai, dai hai, tai ha
hoc tai » hoc dai, hoc tap, hoc bai
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc

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 hoc) or (sach moi)) taip, nghien cuu mot hoc manh tuong hoc tai hai tan phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach hoc) OR (sach moi)) taip, nghien cuu mot hoc manh tuong hoc tai hai tan phan van.
• Adding a wildcard symbol may retrieve word variants: su ((sach hoc) or (sach moi)) taip, nghien cuu mot hoc manh tuong hoc tai hai tan phan van*.