Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
manh tuong » manh tung, manh cuong, minh tuong
sach hoc » cach hoc, sach hoi, mach hoc
cong hoc » dong hoc, cong hoa, cong coc
hoc manh » hoc anh, hoc hanh, hoc danh
tuong ho » tong hop
nhan dan » phan dau, gian dan
nhan tai » hang tai, van tai, toan tai
tu sach » thu sach, su sach, te sach
voi cac » loi cach
da voi » dao voi, dua voi, ba voi
ho da » pho da, ho ba, ho ha

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 hoc tap, nghien thu cong hoc manh tuong ho da voi cac ((nhan dan) or (nhan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien thu cong hoc manh tuong ho da voi cac ((nhan dan) OR (nhan tai)).
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien thu cong hoc manh tuong ho da voi cac ((nhan dan) or (nhan tai))*.