Perhaps you should try some spelling variations:
trong hieu » trong dieu, trong hiep, trung hieu
can trong » cay trong, ban trong, ca trong
hieu thuc » hieu thuoc, hien thuc, hieu tuc
thuc giai » thuoc giao, hoc giai, thuc thai
tri tren » thi tren, tai tren, trinh tren
vu sach » vu bach, su sach, vu khach
tri tre » tri tue, tuoi tre, thi tren

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((tri tre) or (tri tren)) can trong hieu thuc giai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((tri tre) OR (tri tren)) can trong hieu thuc giai.
• Adding a wildcard symbol may retrieve word variants: vu sach ((tri tre) or (tri tren)) can trong hieu thuc giai*.