Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
nam viet » pham viet, lam viec, nam hien
phan lap » phan dau
van phan » van phong, van thanh, luan phan
cham duc » pham duc, cham soc, pham duy
van cham » van chat, van tham, va cham
bac viet » hoc viet, mai viet, dao viet
ty nang » ky nang, ty xang, ty hang
duc van » duc va, duc tan, duc manh
tu sach » su sach, te sach, tu cach
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: ((thu sach) or (tu sach)) ty nang x hoi. hieu van cham duc van phan lap ((nam viet) OR (bac viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ty nang x hoi. hieu van cham duc van phan lap ((nam viet) OR (bac viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (tu sach)) ty nang x hoi. hieu van cham duc van phan lap ((nam viet) OR (bac viet))".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) ty nang x hoi. hieu van cham duc van phan lap ((nam viet) OR (bac viet))*.