Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach tu, sach thu
hang xa » hoang xa, hang ca, lang xa
hieu ve » hieu va, hieu van
ve chao » ve chat, ve cham, ve cho
xu van » tu van, vu van, su van
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: doc sach ty ((hang xa) or (hang va)) hoi. hieu ve chao xu van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ty ((hang xa) OR (hang va)) hoi. hieu ve chao xu van hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: doc sach ty ((hang xa) or (hang va)) hoi. hieu ve chao xu van hanh vi cua te*.