Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
duc manh » suc manh, duc anh, duc minh
nhan tai » hang tai, van tai, toan tai
nhan tri » nhanh thi, thanh tri, chan troi
cau duc » cao duc, cau luc, chu duc
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cua tu » cua tuc, cua su, cua cu

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 ky ((nang xa) OR (lang xa)) hoi. thien van cau duc manh ((nhan tri) or (nhan tai)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((nang xa) OR (lang xa)) hoi. thien van cau duc manh ((nhan tri) OR (nhan tai)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((nang xa) OR (lang xa)) hoi. thien van cau duc manh ((nhan tri) or (nhan tai)) cua tu".
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((nang xa) OR (lang xa)) hoi. thien van cau duc manh ((nhan tri) or (nhan tai)) cua tu*.