Perhaps you should try some spelling variations:
tinh san » trinh san, tinh sang, tinh son
cham duc » pham duc, cham soc, pham duy
tang van » hoang van, trong van, tang luan
dang van » hoang van, hang va
san cua » sang cua, ban cua, dan cua
va tinh » may tinh
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
sach tu » sach thu, cach tu, sach uu
sach ty » sach y, sach thu, xach tay
cua tre » cua te, cuu tre, cua triet

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 tu) OR (sach ty)) ((tang van) or (dang van)) hoi. hieu vu cham duc va tinh san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach tu) OR (sach ty)) ((tang van) OR (dang van)) hoi. hieu vu cham duc va tinh san cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach tu) OR (sach ty)) ((tang van) or (dang van)) hoi. hieu vu cham duc va tinh san cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach tu) OR (sach ty)) ((tang van) or (dang van)) hoi. hieu vu cham duc va tinh san cua tre*.