Perhaps you should try some spelling variations:
trang xa » trang va, trang ha, trong xa
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
tang xa » tang ma, lang xa, tang ha
sach le » cach le, sach de, sach lo
va hanh » van hanh, va thanh, va danh
suc va » duc va, tuc va, luc va
ve cac » va cac, vien cac
va cao » va cac, va co, va dao
vai va » mai va, dai va, hai 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: su sach le ((tang xa) OR (trang xa)) hoi. hieu ((ve cac) or (va cao)) suc va hanh vai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach le ((tang xa) OR (trang xa)) hoi. hieu ((ve cac) OR (va cao)) suc va hanh vai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach le ((tang xa) OR (trang xa)) hoi. hieu ((ve cac) or (va cao)) suc va hanh vai va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach le ((tang xa) OR (trang xa)) hoi. hieu ((ve cac) or (va cao)) suc va hanh vai va thiet*.