Perhaps you should try some spelling variations:
sach trinh » sach tranh, hanh trinh, sach kinh
trinh san » trinh han, trinh quan, trinh toan
tu hoach » thu hoach, tu hach, quy hoach
dinh chi » dinh tri, dinh moi
dinh thi » dinh tri
hoc giao » hoc cao
so giao » so giai
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu hoach ((dinh chi) or (dinh thi)) - so giao ) or ( tu sach trinh san - hoc giao ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu hoach ((dinh chi) OR (dinh thi)) - so giao ) OR ( tu sach trinh san - hoc giao )).
• Adding a wildcard symbol may retrieve word variants: (( tu hoach ((dinh chi) or (dinh thi)) - so giao ) or ( tu sach trinh san - hoc giao ))*.