Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
lang van » dang van, hoang van, giang van
tang van » dang van, hoang van, trong van
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
te sach » toc sach
nay luc » nay lua, nang luc, nhan luc
va nay » va ngay, va cay
va dau » va dao

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 ((lang van) OR (tang van)) hoe. lieu va nay luc ((va danh) or (va hanh)) va dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((lang van) OR (tang van)) hoe. lieu va nay luc ((va danh) OR (va hanh)) va dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((lang van) OR (tang van)) hoe. lieu va nay luc ((va danh) or (va hanh)) va dau tren".
• Adding a wildcard symbol may retrieve word variants: te sach y ((lang van) OR (tang van)) hoe. lieu va nay luc ((va danh) or (va hanh)) va dau tren*.