Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van cham » van chat, van tham, van pham
phan lap » phan dau
nam viet » pham viet, lam viec, bac viet
sach ty » sach y, sach tu, sach thu
va cham » va chat, va tham
duc van » duc va, duc manh, duc phan
ty nang » ky nang, ty xang, ty hang
lap nam » dap nam, lai nam, loai nam
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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