Perhaps you should try some spelling variations:
thien van » thi van
vanh dai » van dai, vanh tai, lanh dao
ve triet » va trien, su triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
van cau » van dau, van hau, van chat
va vanh » va van, va danh, va hanh
cau tu » dau tu, cau truc
dai ve » dap ve, dau ve, dai va

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 ty nang ((ma hoa) or (xa hoi)). thien van cau tu va vanh dai ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((ma hoa) OR (xa hoi)). thien van cau tu va vanh dai ve triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((ma hoa) or (xa hoi)). thien van cau tu va vanh dai ve triet*.