Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
hang cong » dang cong, hang nong, bang cong
ho chieu » theo chieu, doi chieu, mot chieu
tranh va » tranh van, trang va, trinh va
cong dan » cong san, cong tan, huong dan
than tap » han tap, phan tap, than cap
toan tap » toan ban
va hang » van hang, va nang, va lang

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 (hoc thieu)) xanh - canh tranh va hang cong dan ((than tap) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - canh tranh va hang cong dan ((than tap) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoc thieu)) xanh - canh tranh va hang cong dan ((than tap) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) xanh - canh tranh va hang cong dan ((than tap) OR (toan tap))*.