Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nang cau » nang cao, hang cau, nang dau
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
hieu ve » hieu va
cau hoa » cau hoi
cua tec » cua tuc, cua toc, cua viec
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
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 ky nang cau hoa. ((hieu ve) OR (hieu van)) cam xuc va dan vi ((cua te) or (cua tec))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cau hoa. ((hieu ve) OR (hieu van)) cam xuc va dan vi ((cua te) OR (cua tec))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang cau hoa. ((hieu ve) OR (hieu van)) cam xuc va dan vi ((cua te) or (cua tec))*".