Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
trinh van » trinh han, trinh quan, trinh toan
va trinh » van trinh, va tinh, lap trinh
tu sach » thu sach, su sach, te sach
cac xuc » cam xuc, cac nuoc, chat xuc
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
xuc va » duc va, tuc va, luc va
ve cac » va cac, vien cac

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) or (thuoc sach)) ky nang ma hoa. hieu ve cac xuc va trinh van ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky nang ma hoa. hieu ve cac xuc va trinh van ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuoc sach)) ky nang ma hoa. hieu ve cac xuc va trinh van ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky nang ma hoa. hieu ve cac xuc va trinh van ((cuu tre) OR (cua tre))*.