Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
sach tu » sach thu, cach tu, sach uu
sach ty » sach y, sach thu, xach tay
hieu va » lieu va, hieu qua
lam luc » lao luc, lam duoc
va kinh » va tinh, qua kinh
kinh tu » kinh te, tinh tu, dinh tu
nano o » nano 1, nano cuo, nano mot
va lam » van lam, va lap
luc va » duc va, tuc va, loc va
o hoi » co hoi, o hoc, o hai

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) or (sach ty)) nano o hoi. hieu va lam luc va kinh tu va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (sach ty)) nano o hoi. hieu va lam luc va kinh tu va triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) or (sach ty)) nano o hoi. hieu va lam luc va kinh tu va triet*.