Perhaps you should try some spelling variations:
thanh dat » thanh hai, thanh van, thanh ha
te sach » toc sach
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, ma hoa, me hoi
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: te sach y nang ((ma hoi) OR (xa hoi)). hieu ve cac duc va ((thanh dat) or (thanh san)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((ma hoi) OR (xa hoi)). hieu ve cac duc va ((thanh dat) OR (thanh san)) cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((ma hoi) OR (xa hoi)). hieu ve cac duc va ((thanh dat) or (thanh san)) cua te*".