Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
nhan tuc » nhan thuc, nhan luc, nhanh thuc
van nhan » van phan, van thanh, danh nhan
thi van » thi lan, thi hanh, thi nang
hang vi » hang va, hanh vi, hang di
va hang » van hang, va nang, va lang
ty lang » tay lang, ty hang, tu lang
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua
cua te » cua tu

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) OR (doc sach)) ((ty lang) or (ty xang)) xa hoi. thi van nhan tuc va hang vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ((ty lang) OR (ty xang)) xa hoi. thi van nhan tuc va hang vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) ((ty lang) or (ty xang)) xa hoi. thi van nhan tuc va hang vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) ((ty lang) or (ty xang)) xa hoi. thi van nhan tuc va hang vi cua te*.