Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
hanh dao » lanh dao, thanh dat, thanh dam
pham duy » pham duc
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
dao cua » dai cua, day cua, dan cua
tu sach » thu sach, su sach, te sach

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 tru nang xa hoi. ((hieu ve) OR (hieu van)) ((cham soc) or (pham duy)) va hanh dao cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tru nang xa hoi. ((hieu ve) OR (hieu van)) ((cham soc) OR (pham duy)) va hanh dao cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tru nang xa hoi. ((hieu ve) OR (hieu van)) ((cham soc) or (pham duy)) va hanh dao cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach tru nang xa hoi. ((hieu ve) OR (hieu van)) ((cham soc) or (pham duy)) va hanh dao cua viet*.