Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
thanh ha » thanh hoa, thanh hai, nhanh ha
thanh va » thanh van, hanh va, thanh ve
nuoc gia » nuoc giai, nuoc giao, quoc gia
toc sach » hoc sach, doc sach, thuoc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
ve dat » de dat, va dat, ve dao
ma hoi » mai hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang ((ma hoi) or (xa hoi)). hieu ve dat nuoc gia ((thanh va) OR (thanh ha)) cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang ((ma hoi) OR (xa hoi)). hieu ve dat nuoc gia ((thanh va) OR (thanh ha)) cau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang ((ma hoi) or (xa hoi)). hieu ve dat nuoc gia ((thanh va) OR (thanh ha)) cau triet".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang ((ma hoi) or (xa hoi)). hieu ve dat nuoc gia ((thanh va) OR (thanh ha)) cau triet*.