Perhaps you should try some spelling variations:
thien van » thi van
cham toc » cham soc, cham o, cao toc
thanh ve » hanh ve, thanh va, thanh vien
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cac toc » cac toi, cac nuoc, cac thoi
cu tren » tu tren, dua tren
ve cu » ve cau, ve chu, ve cua

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 xa hoi. ((lieu va) or (thien van)) ((cham toc) OR (cac toc)) gia thanh ve cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. ((lieu va) OR (thien van)) ((cham toc) OR (cac toc)) gia thanh ve cu tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. ((lieu va) or (thien van)) ((cham toc) OR (cac toc)) gia thanh ve cu tren*".