Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
sach nay » sach hay, sach vay, sach nang
sach tay » xach tay, sach hay, sach tai
cac truc » cau truc, cac tru, cac trung
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
va hanh » van hanh, va danh, ban hanh
vi cua » vai cua, di cua
ve cac » va cac, vien cac
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: tu ((sach tay) OR (sach nay)) lang xa hoi. hieu ve cac truc ((va hanh) or (va thanh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tay) OR (sach nay)) lang xa hoi. hieu ve cac truc ((va hanh) OR (va thanh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tay) OR (sach nay)) lang xa hoi. hieu ve cac truc ((va hanh) or (va thanh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tay) OR (sach nay)) lang xa hoi. hieu ve cac truc ((va hanh) or (va thanh)) vi cua te*.