Perhaps you should try some spelling variations:
sach trinh » sach tranh, hanh trinh, sach kinh
trinh chat » tinh chat, trinh luat, trinh han
nghiem van » nghiem ban, nghiep van, nghiem xuan
khach thi » khac thi, khach trai, quach thi
nghiem va » nghiep va, nghiep vua, nghiep vu
vu khach » vu khanh, vu khac, vay khach
te sach » toc sach
chat xe » chat deo, chat xuc, chat beo
xe hoc » te hoc, de hoc, xa hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach trinh chat xe hoc ) or ( vu khach thi ((nghiem van) OR (nghiem va)) hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach trinh chat xe hoc ) OR ( vu khach thi ((nghiem van) OR (nghiem va)) hoc ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( te sach trinh chat xe hoc ) or ( vu khach thi ((nghiem van) OR (nghiem va)) hoc ))*".