Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
van thanh » ban thanh, van tuan
va trien » va truyen, va thiet, va tuyen
hieu van » thien van, lieu va, hieu ve
va triet » va thiet, ve triet, cua triet
chat duc » chat xuc, chat doc, chet duoc
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
duc van » duc va, duc tan, duc manh
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach

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 va) or (hieu van)) chat duc van thanh lap ((va triet) OR (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. ((hieu va) OR (hieu van)) chat duc van thanh lap ((va triet) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. ((hieu va) or (hieu van)) chat duc van thanh lap ((va triet) OR (va trien))".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. ((hieu va) or (hieu van)) chat duc van thanh lap ((va triet) OR (va trien))*.