Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
nhan luc » nang luc
hieu van » hieu va, thien van, lieu va
van nhan » van phan, van thanh, danh nhan
van hoe » van hoa, van hoc, van hieu
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
va danh » va dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh
te sach » toc sach
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 ((ky lang) or (ky tang)) van hoe. hieu van nhan luc ((va danh) or (va dinh)) va dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky lang) OR (ky tang)) van hoe. hieu van nhan luc ((va danh) OR (va dinh)) va dau tren.
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) or (ky tang)) van hoe. hieu van nhan luc ((va danh) or (va dinh)) va dau tren*.