Perhaps you should try some spelling variations:
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sach tu » sach thu, cach tu, sach ty
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua
va cam » va cham, va cac, va cao

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 y) or (sach tu)) nang xa hoi. hieu va cam tuc va dan ((di cua) OR (de cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach y) OR (sach tu)) nang xa hoi. hieu va cam tuc va dan ((di cua) OR (de cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach y) or (sach tu)) nang xa hoi. hieu va cam tuc va dan ((di cua) OR (de cua)) triet".
• Adding a wildcard symbol may retrieve word variants: te ((sach y) or (sach tu)) nang xa hoi. hieu va cam tuc va dan ((di cua) OR (de cua)) triet*.