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