Perhaps you should try some spelling variations:
sach trinh » hanh trinh, sach kinh, sach tren
sach tranh » canh tranh
trach hiem » trach nhiem
nghiep du » nghiep dau, nghiep vu, nghiep tu
hiem du » hien du, diem du, hiem duoc
du hoc » tu hoc, duoc hoc
tu sat » tu bat, tu dat, tu hat

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 trinh) OR (sach tranh)) nghiep du hoc ) or ( tu sat trach hiem du hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su ((sach trinh) OR (sach tranh)) nghiep du hoc ) OR ( tu sat trach hiem du hoc ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su ((sach trinh) OR (sach tranh)) nghiep du hoc ) or ( tu sat trach hiem du hoc ))*".