Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van tuan » van quan, van ban, anh tuan
cham duc » pham duc, cham soc, pham duy
cua tre » cua te, cuu tre, dua tren
tuan va » toan va, luan va, quan va
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
hieu va » lieu va, hieu qua
ha hoi » hoa hoi, ha noi, xa hoi

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 lang ha hoi. ((hieu ve) or (hieu va)) cham duc van tuan va ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang ha hoi. ((hieu ve) OR (hieu va)) cham duc van tuan va ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang ha hoi. ((hieu ve) or (hieu va)) cham duc van tuan va ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang ha hoi. ((hieu ve) or (hieu va)) cham duc van tuan va ((cua tre) OR (cua triet))*.