Perhaps you should try some spelling variations:
khau sach » hau sach, khoa sach, pham sach
rau sach » cau sach, hau sach, nam sach
trang va » hang va
tran van » luan van
song dan » song danh, song van, cong dan
dan tran » dang tran, tan tran, dan than
tran cao » toan cao, tran chau, trang cho

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((rau sach) or (khau sach)) - canh ((trang va) OR (tran van)) nang song dan tran cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((rau sach) OR (khau sach)) - canh ((trang va) OR (tran van)) nang song dan tran cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((rau sach) or (khau sach)) - canh ((trang va) OR (tran van)) nang song dan tran cao".
• Adding a wildcard symbol may retrieve word variants: theo ((rau sach) or (khau sach)) - canh ((trang va) OR (tran van)) nang song dan tran cao*.