Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
tru nang » tra nang, tri nang, truc nano
van hanh » van thanh, ban hanh, van anh
hai cua » thai cua, dai cua, hoi cua
lai cua » dai cua, lai chau, thai cua
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, te sach
hieu vu » hieu va, hieu ve, hieu su
tu nang » tu nong, tu nano, tu lang
vu cham » va cham, vu kham, tu cham

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((tu nang) or (tru nang)) xa hoi. hieu vu cham duc van hanh ((lai cua) or (hai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu nang) OR (tru nang)) xa hoi. hieu vu cham duc van hanh ((lai cua) OR (hai cua)) triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu nang) or (tru nang)) xa hoi. hieu vu cham duc van hanh ((lai cua) or (hai cua)) triet*.