Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
xa nang » va nang, xa nong, ca nang
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
da nang » cam nang, kha nang, cao nang
cac toc » cac toi, cac nuoc, cac thoi
ve cac » va cac, vien cac
doi va » hoi va, noi va, dai va
thiet* » thieu*

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) OR (thu sach)) ky lang xa hoi. hieu ve cac toc ((xa nang) or (da nang)) doi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky lang xa hoi. hieu ve cac toc ((xa nang) OR (da nang)) doi va thiet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky lang xa hoi. hieu ve cac toc ((xa nang) or (da nang)) doi va thiet*".