Perhaps you should try some spelling variations:
trien thai » trien khai, trien thi, trien thanh
chai khoa » chi khoa, pham khoa, tai khoa
thai khoa » tai khoa, nhi khoa, hoi khoa
doc sach » hoc sach, toc sach, nuoc sach
sach xin » sach kinh, sach tien, sach xa
xin chai » xin chan, bia chai, lin thai
khoa hoc » hoa hoc
so sach » so sanh, bo sach, co sach
vu sach » vu bach, su sach, vu khach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( doc sach xin chai khoa hoc ) or ( ((so sach) or (vu sach)) trien thai khoa hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( doc sach xin chai khoa hoc ) OR ( ((so sach) OR (vu sach)) trien thai khoa hoc )).
• Adding a wildcard symbol may retrieve word variants: (( doc sach xin chai khoa hoc ) or ( ((so sach) or (vu sach)) trien thai khoa hoc ))*.