Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
hanh tang » hanh trang, hanh mang, hanh tung
cua trong » cua truong, cua trung, qua trong
ho chieu » theo chieu, doi chieu, mot chieu
anh tang » anh bang, anh dang, anh nang
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thieu) or (ho chieu)) xanh - ((hanh tang) or (anh tang)) cua trong cong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (ho chieu)) xanh - ((hanh tang) OR (anh tang)) cua trong cong tap toan cao.
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (ho chieu)) xanh - ((hanh tang) or (anh tang)) cua trong cong tap toan cao*.