Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
thi nang » thi cong, ki nang, thi hanh
sach thi » sach thu, sach tai, sach thieu
lai cua » dai cua, hai cua, lai chau
vai cua » dai cua, hai cua, bai cua
va danh » va dinh, va dan, va hanh
vu sach » vu bach, su sach, vu khach
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach thi nang xa hoi. ((hieu ve) OR (hieu va)) cham duc va danh ((vai cua) or (lai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach thi nang xa hoi. ((hieu ve) OR (hieu va)) cham duc va danh ((vai cua) OR (lai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach thi nang xa hoi. ((hieu ve) OR (hieu va)) cham duc va danh ((vai cua) or (lai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: vu sach thi nang xa hoi. ((hieu ve) OR (hieu va)) cham duc va danh ((vai cua) or (lai cua)) triet*.