Perhaps you should try some spelling variations:
thanh do » thanh de, thanh pho, thanh hoa
thanh di » thanh doi, thanh de, thanh dinh
tu lang » cu lang, tu lanh, xu lang
duc gia » quoc gia
hieu va » lieu va, hieu qua
lang ky » dang ky, tang ky, bang ky
cam duc » cam xuc, cao duc, pham duc
va cam » va cham, va cac, va cao
co hoi » co hoc, co loi
cua te » cua tu
o hoi » o hoc, o hai, o hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu lang ky nang ((o hoi) or (co hoi)). hieu va cam duc gia ((thanh di) OR (thanh do)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu lang ky nang ((o hoi) OR (co hoi)). hieu va cam duc gia ((thanh di) OR (thanh do)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu lang ky nang ((o hoi) or (co hoi)). hieu va cam duc gia ((thanh di) OR (thanh do)) cua te".
• Adding a wildcard symbol may retrieve word variants: tu lang ky nang ((o hoi) or (co hoi)). hieu va cam duc gia ((thanh di) OR (thanh do)) cua te*.