Perhaps you should try some spelling variations:
truong quan » trong quan, thong quan, truong van
luong quan » thong quan, duong qua
hang huong » hang thuong, hang luong, hoang phuong
theo sach » thuoc sach, te sach, theo lich
hieu cac » hieu luc, hieu va, hieu van
dan phan » doan phan, dan chan, van phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((theo sach) or (hieu cac)) - thanh ((truong quan) OR (luong quan)) hang huong dan phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((theo sach) OR (hieu cac)) - thanh ((truong quan) OR (luong quan)) hang huong dan phan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((theo sach) or (hieu cac)) - thanh ((truong quan) OR (luong quan)) hang huong dan phan tu".
• Adding a wildcard symbol may retrieve word variants: hoc ((theo sach) or (hieu cac)) - thanh ((truong quan) OR (luong quan)) hang huong dan phan tu*.