Perhaps you should try some spelling variations:
ve triet » va trien, su triet
dinh hai » dinh thai, tinh hai, dinh ha
dan dinh » dang dinh, doan dinh, van dinh
thuc dan » thuc hanh, hoc dan, thuc vat
hac thuc » hoc thuc, ha thuc, thach thuc
hieu van » hieu va, thien van, hieu ve
nang xa » lang xa, nang ma, mang xa
sach tu » sach thu, cach tu, sach ty
tu sach » thu sach, su sach, te sach
hai ve » hoai ve, hai va, hai vu

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 x)) hoi. ((hieu van) or (lieu va)) hac thuc dan dinh hai ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu ((nang xa) OR (nang x)) hoi. ((hieu van) OR (lieu va)) hac thuc dan dinh hai ve triet.
• Adding a wildcard symbol may retrieve word variants: tu sach tu ((nang xa) or (nang x)) hoi. ((hieu van) or (lieu va)) hac thuc dan dinh hai ve triet*.