Perhaps you should try some spelling variations:
phan luc » nhan luc, phan duc, phan suc
su sach » so sach, vu sach
va tinh » may tinh
hieu va » lieu va, hieu qua
va phan » van phan, va phat, va phap
nang xa » nang x, lang xa, nang ma
te sach » toc sach
luc va » duc va, tuc va, loc va
do cua » doi cua, co cua, dong cua
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (te sach)) ky nang xa hoi. hieu va phan luc va tinh ((do cua) OR (de cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky nang xa hoi. hieu va phan luc va tinh ((do cua) OR (de cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (te sach)) ky nang xa hoi. hieu va phan luc va tinh ((do cua) OR (de cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky nang xa hoi. hieu va phan luc va tinh ((do cua) OR (de cua)) tre*.