Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cham duc » pham duc, cham soc, pham duy
nam viet » pham viet, bac viet, nam hien
phan lap » phan dau
hieu van » hieu va, thien van, hieu ve
van phan » van phong, van thanh, luan phan
duc van » duc va, duc tan, duc manh
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai
viec » vien

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