Perhaps you should try some spelling variations:
quan nhung » qua nhung, cua nhung, luan chung
hieu lang » chieu sang, hieu quang, nhieu tang
hanh nang » anh nang, ganh nang, hanh mang
nang quan » ban quan, nang suat
tuong dan » huong dan, xuong dan, truong dai
hieu van » hieu va, thien van, lieu va
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: theo ((hieu lang) or (hieu van)) - hanh nang quan nhung ((tuong dan) OR (tung dan)) than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (hieu van)) - hanh nang quan nhung ((tuong dan) OR (tung dan)) than ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) or (hieu van)) - hanh nang quan nhung ((tuong dan) OR (tung dan)) than ban".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (hieu van)) - hanh nang quan nhung ((tuong dan) OR (tung dan)) than ban*.