Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
canh trinh » canh tranh, hanh trinh, canh tinh
nguong dan » huong dan
hoc thieu » toc thieu, hoc hien
han thang » van thang, han chang, nhanh thang
van khang » van khanh, van thanh, van quang
chan cap » khan cap, cao cap, phan cac
than cap » khan cap, thanh lap, thanh cac

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 xanh - canh trinh ((han thang) or (van khang)) nguong dan ((chan cap) OR (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh trinh ((han thang) OR (van khang)) nguong dan ((chan cap) OR (than cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - canh trinh ((han thang) or (van khang)) nguong dan ((chan cap) OR (than cap))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh trinh ((han thang) or (van khang)) nguong dan ((chan cap) OR (than cap))*.