Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
cac luc » cau luc, coc luc, cac nuoc
va hanh » van hanh, va danh, ban hanh
y nang » ky nang, ly nang, v nang
di cua » dai cua, doi cua, de cua
cua te » cua tu

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 y nang xa hoi. ((hieu va) OR (lieu va)) cac luc ((va hanh) or (va thanh)) di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. ((hieu va) OR (lieu va)) cac luc ((va hanh) OR (va thanh)) di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. ((hieu va) OR (lieu va)) cac luc ((va hanh) or (va thanh)) di cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. ((hieu va) OR (lieu va)) cac luc ((va hanh) or (va thanh)) di cua te*.