Perhaps you should try some spelling variations:
trien viet » tieng viet
quan hoang » luan hoan
hoang va » hoang van, hang va, hoang ha
duc quan » luc quan, cuc quan, dung quan
viet cua » viec cua, viet ca, viet qua
cua duc » cua tuc, cua nuoc, cua quoc
tu sach » thu sach, su sach, tu cach
ly nang » ky nang, ly hang, ly vang
te sach » toc sach
va cua » va chua, via cua, ca cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) ((ly nang) or (le van)) xa hoi. trien viet cua duc quan hoang va cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ((ly nang) OR (le van)) xa hoi. trien viet cua duc quan hoang va cua tu.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ((ly nang) or (le van)) xa hoi. trien viet cua duc quan hoang va cua tu*.