Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
hieu van » thien van, lieu va, hieu ve
cap nuoc » dat nuoc
cau treo » cau theo, cau tren, cau triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
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: su sach ky nang x hoi. ((hieu van) OR (hieu va)) cap nuoc va ((nhanh thai) or (hoang thi)) cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. ((hieu van) OR (hieu va)) cap nuoc va ((nhanh thai) OR (hoang thi)) cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. ((hieu van) OR (hieu va)) cap nuoc va ((nhanh thai) or (hoang thi)) cau treo".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. ((hieu van) OR (hieu va)) cap nuoc va ((nhanh thai) or (hoang thi)) cau treo*.