Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
phan lap » phan dau
va phan » van phan, va phat, va phap
truc va » thuc va, thuc vat, trung va
sach ty » sach y, sach thu, xach tay
nang ho » nang hoc, nang co, tang ho
sach tu » sach thu, cach tu, sach uu
hieu su » hieu sau, tieu su, hieu so
ho hoi » hoc hoi, hoa hoi, hoi hoi
lap su » lap du, lap tu, lai su

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 ty) OR (sach tu)) nang ho hoi. ((hieu su) or (lieu va)) cau truc va phan lap su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tu)) nang ho hoi. ((hieu su) OR (lieu va)) cau truc va phan lap su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach tu)) nang ho hoi. ((hieu su) or (lieu va)) cau truc va phan lap su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach tu)) nang ho hoi. ((hieu su) or (lieu va)) cau truc va phan lap su triet*.