Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
sach tu » sach thu, sach ty, sach uu
cach tu » cach thuc
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
lap luc » ap luc, tap luc, lao luc
va nang » van nang, da nang, cam nang
nang va » nang van, hang va, nang ma
va lap » va dap
luc va » duc va, tuc va, loc va
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach tu) or (cach tu)) lang xa hoi. hieu va lap luc va nang va cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tu) OR (cach tu)) lang xa hoi. hieu va lap luc va nang va cua viet.
• Adding a wildcard symbol may retrieve word variants: te ((sach tu) or (cach tu)) lang xa hoi. hieu va lap luc va nang va cua viet*.