Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, hieu ve
ban hanh » ban hang
hanh hai » thanh hai, nhanh hai, hang hai
dau tren » dau tien, dat tren, dau tieng
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
nam luc » nang luc, nhan luc, nam thuc
luc ban » duc ban, cuc ban, luc bat
hai dau » han dau, hai dan, hai hau

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ly nang x ho. ((hieu van) or (lieu va)) nam luc ban hanh hai dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ly nang x ho. ((hieu van) OR (lieu va)) nam luc ban hanh hai dau tren.
• Adding a wildcard symbol may retrieve word variants: thu sach ly nang x ho. ((hieu van) or (lieu va)) nam luc ban hanh hai dau tren*.