Perhaps you should try some spelling variations:
tranh trong » tran trong, trinh trong, anh trong
dung cuong » dung cong, dung luong, dang cuong
trong vat » trong van, trong va, trong dat
ho chieu » theo chieu, hoc thieu, doi chieu
vat dung » van dung, va dung, viet dung
tap toan » tap doan, tap quan
bai toan » bai tap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (doi chi)) xanh - tranh trong vat dung cuong ((tap toan) or (bai toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chi)) xanh - tranh trong vat dung cuong ((tap toan) OR (bai toan)) tap.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chi)) xanh - tranh trong vat dung cuong ((tap toan) or (bai toan)) tap*.