Perhaps you should try some spelling variations:
cham thu » cam thu, nham thu, pham thu
hang tai » hang va, dung tai
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
va hang » van hang, va nang, va lang
thu va » thuc va, thue va, tu va
tai su » tai so, tai tu, lai 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 va) OR (hieu qua)) cham thu va hang tai su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. ((hieu va) OR (hieu qua)) cham thu va hang tai su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. ((hieu va) OR (hieu qua)) cham thu va hang tai su triet*.