Perhaps you should try some spelling variations:
thanh lap » thanh san, thanh hai, thanh van
cam viet » cham viet, ca viet, cao viet
hieu van » hieu va, thien van, lieu va
phan lap » phan dau
cham duc » pham duc, cham soc, pham duy
van cham » van chat, van tham, va cham
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
tu sach » thu sach, te sach, tu cach
x hoi » xa hoi, o hoi, x ho

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 (su sach)) ty nang x hoi. hieu van cham duc va ((thanh lap) or (phan lap)) cam viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty nang x hoi. hieu van cham duc va ((thanh lap) OR (phan lap)) cam viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ty nang x hoi. hieu van cham duc va ((thanh lap) or (phan lap)) cam viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ty nang x hoi. hieu van cham duc va ((thanh lap) or (phan lap)) cam viet*.