Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » thien van, lieu va
cau phuc » cau truc, chau phu, huu phuc
cau tren » cu tren, dau tren, ca tren
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va, hieu qua
phuc va » phuc vu, thuc va, chuc va
va hanh » van hanh, va thanh, va danh
vi cau » va cau, ve cau, di cau

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 (hieu ve))) or (hieu va)) cau phuc va hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ly nang x ho. ((((hieu van) OR (hieu ve))) OR (hieu va)) cau phuc va hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: thu sach ly nang x ho. ((((hieu van) or (hieu ve))) or (hieu va)) cau phuc va hanh vi cau tren*.