Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
trung cap » truong cao, trung tam
truong va » truong dai, truong cao, truong dao
tuong dan » huong dan, xuong dan, truong dai
hoc hieu » hoc thieu, hoc hien, doc hieu
tung dan » dung dan, huong dan, trung dai
than ban » thanh ban, toan ban, than man

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - hanh ((trung cap) or (truong va)) nhung ((tuong dan) OR (tung dan)) than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh ((trung cap) OR (truong va)) nhung ((tuong dan) OR (tung dan)) than ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - hanh ((trung cap) or (truong va)) nhung ((tuong dan) OR (tung dan)) than ban".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh ((trung cap) or (truong va)) nhung ((tuong dan) OR (tung dan)) than ban*.