Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
danh hai » dang hai, lanh hai, manh hai
va danh » va dinh, va dan, va hanh
hac xuc » chat xuc
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
hieu va » lieu va, hieu qua
va hac » van hac, va khac, va cac
xuc va » duc va, tuc va, luc va

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 tu ((nang xa) or (nang ma)) hoi. hieu va hac xuc va danh hai ((cua triet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu ((nang xa) OR (nang ma)) hoi. hieu va hac xuc va danh hai ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu ((nang xa) or (nang ma)) hoi. hieu va hac xuc va danh hai ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach tu ((nang xa) or (nang ma)) hoi. hieu va hac xuc va danh hai ((cua triet) OR (cua viet))*.