Perhaps you should try some spelling variations:
khong trong » khoang trong, phong trong, thuong trong
thong trong » thuong trong, thong thong, thong thuong
hoc thieu » hoc hien
hanh tang » hanh trang, anh tang, hanh mang
sang toan » sang than, dang toan, quang toan
tang cua » mang cua, hang cua, tang luan
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 (toc thieu)) quang - hanh tang cua ((khong trong) OR (thong trong)) sang toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (toc thieu)) quang - hanh tang cua ((khong trong) OR (thong trong)) sang toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (toc thieu)) quang - hanh tang cua ((khong trong) OR (thong trong)) sang toan cao*".