Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
lang van » dang van, tang van, hoang van
sang ky » sang kyo, dang ky, tang ky
cua tre » cua te, cuu tre, cua triet
vu cham » va cham, vu kham, tu cham
tu sang » thu sang, tu san, tu lang
ve cham » va cham, ve chat, ve chim
van hoi » van hoa, van hoc, van hoe
ky lang » ky nang, ky dang, ky tang
doc ca » doc cao, doc cua, doc va
ca dan » cac dan, ca dao
dan vi » doan vi, don vi, dan va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sang ky lang van hoi. hieu ((ve cham) OR (vu cham)) doc ca dan vi ((cua tre) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sang ky lang van hoi. hieu ((ve cham) OR (vu cham)) doc ca dan vi ((cua tre) OR (dau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sang ky lang van hoi. hieu ((ve cham) OR (vu cham)) doc ca dan vi ((cua tre) or (dau tren))*".