Perhaps you should try some spelling variations:
luan trong » quan trong, luat trong, luan tuong
thieu tinh » trieu tinh, chieu tinh, thien tinh
thuong han » thuong mai, thuong va, thuong gap
hoc thieu » toc thieu, hoc hien
hanh tang » hanh trang, anh tang, hanh tung
hanh mang » nhanh mang, hanh trang, nhanh lang
tuong han » tuong phan, tuong dan, tuong ban
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 tinh - ((hanh tang) or (hanh mang)) luan trong ((tuong han) OR (thuong han)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tinh - ((hanh tang) OR (hanh mang)) luan trong ((tuong han) OR (thuong han)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tinh - ((hanh tang) or (hanh mang)) luan trong ((tuong han) OR (thuong han)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tinh - ((hanh tang) or (hanh mang)) luan trong ((tuong han) OR (thuong han)) toan cao*.