Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
xa khanh » xa thanh, van khanh, dat khanh
tu sach » thu sach, su sach, te sach
xa hanh » xa thanh, va hanh, da hanh
cau tuc » cau truc, cau tu, cau luc
van cau » van dau, van hau, van chat
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((y nang) or (v nang)) xa hoi. hieu van cau tuc ((xa hanh) OR (xa khanh)) vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (v nang)) xa hoi. hieu van cau tuc ((xa hanh) OR (xa khanh)) vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) or (v nang)) xa hoi. hieu van cau tuc ((xa hanh) OR (xa khanh)) vi cua tu".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (v nang)) xa hoi. hieu van cau tuc ((xa hanh) OR (xa khanh)) vi cua tu*.