Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
thuc va » thuc dan, thuc day
su sach » so sach, vu sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve cuu » ve cau, ve chu, ve cua
vi va » vi van, vai va, vu va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((nang xa) or (nang ma)) hoi. hieu ve cuu ((thuc va) OR (thuc vat)) hanh vi va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (nang ma)) hoi. hieu ve cuu ((thuc va) OR (thuc vat)) hanh vi va trien*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) or (nang ma)) hoi. hieu ve cuu ((thuc va) OR (thuc vat)) hanh vi va trien*".