Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
ve triet » va trien, su triet
van hanh » ban hanh, van anh, van ban
cau luc » cau truc, cau phuc
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
gi ve » gia ve, gi de, gi he

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty nang xa hoi. ((hieu va) or (hieu qua)) cau luc ((van hanh) OR (van thanh)) gi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang xa hoi. ((hieu va) OR (hieu qua)) cau luc ((van hanh) OR (van thanh)) gi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang xa hoi. ((hieu va) or (hieu qua)) cau luc ((van hanh) OR (van thanh)) gi ve triet".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang xa hoi. ((hieu va) or (hieu qua)) cau luc ((van hanh) OR (van thanh)) gi ve triet*.