Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
su triet » su viet, su tien, ve triet
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
luc van » luoc van, luu van, luc va
ve cam » ve cham, ve cac, va cam
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: tu sach ty nang x hoi. hieu ve cam ((luc van) OR (duc van)) thanh lap ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. hieu ve cam ((luc van) OR (duc van)) thanh lap ((cua tre) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. hieu ve cam ((luc van) OR (duc van)) thanh lap ((cua tre) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. hieu ve cam ((luc van) OR (duc van)) thanh lap ((cua tre) or (su triet))*.