Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thanh vi » hanh vi, thanh va, thanh ve
luoc gia » quoc gia, luc gia, luong gia
cam luoc » cam xuc, tom luoc, cam lo
cau tren » cu tren, dau tren, ca tren
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
nang xa » nang x, nang ma, mang xa
hieu ve » hieu va, hieu van
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty ((nang xa) or (lang xa)) hoi. ((hieu ve) or (hieu qua)) cam luoc gia thanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty ((nang xa) OR (lang xa)) hoi. ((hieu ve) OR (hieu qua)) cam luoc gia thanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: toc sach ty ((nang xa) or (lang xa)) hoi. ((hieu ve) or (hieu qua)) cam luoc gia thanh vi cau tren*.