Perhaps you should try some spelling variations:
thanh ve » thanh va, thanh vien, thanh van
hieu van » hieu va, thien van, lieu va
cham toc » cham soc, cham o, cao toc
su sach » so sach, vu sach
cac toc » cac toi, cac nuoc, cac thoi
hanh ve » hanh vi, hanh va, hanh kem
tu tren » tu truyen, tu tieng, tu trong
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang

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 ty nang xa hoi. hieu van ((cham toc) OR (cac toc)) gia ((thanh ve) or (hanh ve)) tu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu van ((cham toc) OR (cac toc)) gia ((thanh ve) OR (hanh ve)) tu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. hieu van ((cham toc) OR (cac toc)) gia ((thanh ve) or (hanh ve)) tu tren".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu van ((cham toc) OR (cac toc)) gia ((thanh ve) or (hanh ve)) tu tren*.