Perhaps you should try some spelling variations:
giang day » gian dan
toc sach » hoc sach, doc sach, thuoc sach
dang van » hoang van, hang va
hieu van » thien van, lieu va, hieu ve
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nam luc » nang luc, nhan luc, nam thuc
va danh » va dinh, va dan, va hanh
danh va » doanh va, hanh va, anh va
luc va » duc va, tuc va, loc va
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky ((giang day) or (dang van)) hoe. ((hieu van) OR (hieu va)) nam luc va danh va cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((giang day) OR (dang van)) hoe. ((hieu van) OR (hieu va)) nam luc va danh va cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((giang day) or (dang van)) hoe. ((hieu van) OR (hieu va)) nam luc va danh va cau tren*".