Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tinh lai » tinh lao, tinh hai, minh lai
chat tuc » chat xuc, luat tuc, chat huu
cua tre » cua te, cua triet, dua tren
va tinh » may tinh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cuu tre » cau tren, cau treo
tuc va » thuc va, truc va, tuc xa

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 ve) OR (hieu van)) chat tuc va tinh lai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. ((hieu ve) OR (hieu van)) chat tuc va tinh lai ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. ((hieu ve) OR (hieu van)) chat tuc va tinh lai ((cua tre) or (cuu tre))*".