Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh dao » lanh dao, thanh dat, thanh dam
thuc va » thuc vat, thuc dan, thuc day
truc va » thuc vat, trung va
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
sach 2 » sach y
dao su » dao suu, dan su, cao su
ve cam » ve cham, ve cac, va cam

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 2 ((nang xa) OR (nang x)) hoi. hieu ve cam ((truc va) or (thuc va)) hanh dao su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach 2 ((nang xa) OR (nang x)) hoi. hieu ve cam ((truc va) OR (thuc va)) hanh dao su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach 2 ((nang xa) OR (nang x)) hoi. hieu ve cam ((truc va) or (thuc va)) hanh dao su triet".
• Adding a wildcard symbol may retrieve word variants: su sach 2 ((nang xa) OR (nang x)) hoi. hieu ve cam ((truc va) or (thuc va)) hanh dao su triet*.