Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu va » lieu va, hieu qua
cam loc » cam lo
va danh » va dinh, va dan, va hanh
y nang » ly nang, v nang, may nang
va cam » va cham, va cac, va cao
loc va » hoc va, luc va
tu cuu » tu huu, tu cua, tu chu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((y nang) OR (ky nang)) xa hoi. hieu va cam loc va danh ((du cuu) OR (tu cuu)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((y nang) OR (ky nang)) xa hoi. hieu va cam loc va danh ((du cuu) OR (tu cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((y nang) OR (ky nang)) xa hoi. hieu va cam loc va danh ((du cuu) OR (tu cuu)) tre*.