Perhaps you should try some spelling variations:
sach tu » sach thu, cach tu, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
doi cua » dai cua, hoi cua, dong cua
va cam » va cham, va cac, va cao
cam tu » cam thu, nam tu, dam tu
di cua » dai cua, de cua, do 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 y) or (sach tu)) nang xa hoi. hieu va cam tu va danh ((di cua) or (doi cua)) tre~.
• 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 tu va danh ((di cua) OR (doi cua)) tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach y) or (sach tu)) nang xa hoi. hieu va cam tu va danh ((di cua) or (doi cua)) tre*.