Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
thu sach » tu sach, thuat sach, thuoc sach
cau phuc » cau truc, chau phu, huu phuc
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
hieu ve » hieu va, hieu van
phuc va » phuc vu, thuc va, chuc va
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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