Perhaps you should try some spelling variations:
thanh le » thinh le, thanh ve, thanh de
thanh li » thanh loi, nhanh li, thanh liem
co sach » bo sach, cuon sach, hoc sach
dua ban » dia ban, cua ban, qua ban
cao dua » cao duc, ca dua, cay dua
hieu ve » hieu va, hieu van
vu sach » vu bach, su sach, vu khach
la tren » loai tren, dua tren, dat tren
ve cao » va cao, ve bao, ve cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((co sach) or (vu sach)) ky nang x ho. hieu ve cao dua ban ((thanh li) OR (thanh le)) la tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co sach) OR (vu sach)) ky nang x ho. hieu ve cao dua ban ((thanh li) OR (thanh le)) la tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((co sach) or (vu sach)) ky nang x ho. hieu ve cao dua ban ((thanh li) OR (thanh le)) la tren".
• Adding a wildcard symbol may retrieve word variants: ((co sach) or (vu sach)) ky nang x ho. hieu ve cao dua ban ((thanh li) OR (thanh le)) la tren*.