Perhaps you should try some spelling variations:
phan duc » pham duc, phan dau, tran duc
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
hieu ke » hieu kem, chieu ke, hieu ky
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
oi su » ki su, vi su
ve su » va su

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 ty nang xa hoi. hieu ke ((phan duc) OR (phan tu)) va hanh ((oi su) or (ve su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu ke ((phan duc) OR (phan tu)) va hanh ((oi su) OR (ve su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu ke ((phan duc) OR (phan tu)) va hanh ((oi su) or (ve su)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ke ((phan duc) OR (phan tu)) va hanh ((oi su) or (ve su)) triet*.