Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
phan lap » phan dau
vat phan » va phan, van phan, sat phan
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
hoc hoi » hoc khoi, hoc hoa, hoc noi
ty nang » ky nang, ty xang, ty hang
va cau » van cau, va cac, va cao
va dau » va dao
ho hoi » hoa hoi, hoi hoi, co 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 nang ((ho hoi) or (hoc hoi)). hieu ((va cau) or (va dau)) thuc vat phan lap su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((ho hoi) OR (hoc hoi)). hieu ((va cau) OR (va dau)) thuc vat phan lap su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((ho hoi) or (hoc hoi)). hieu ((va cau) or (va dau)) thuc vat phan lap su triet*.