Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
tru nang » tra nang, tri nang, thi nang
van hau » van ha, van hai, van dau
hau duc » huu duc, ha duc, pham duc
duc van » duc va, duc tan, duc manh
tu nang » tu nong, tu nano, tu lang
su sach » so sach, vu sach
vi cau » va cau, ve cau, di cau

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 ((tu nang) or (((tru nang) or (truc nano)))) xa hoi. hieu van hau duc van thanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((tu nang) OR (((tru nang) OR (truc nano)))) xa hoi. hieu van hau duc van thanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: su sach ((tu nang) or (((tru nang) or (truc nano)))) xa hoi. hieu van hau duc van thanh vi cau tren*.