Perhaps you should try some spelling variations:
cham xuc » cam xuc, chat xuc, cham soc
van hanh » van thanh, ban hanh, van ban
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
van anh » van thanh, tuan anh, van minh
cua tuc » cua duc, cua tu, cua thuoc
y tang » ky tang, 7 tang, 5 tang
vi cua » vai cua, di cua

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 tang) OR (6 tang)) dai hoc. hieu ve cham xuc ((van hanh) or (van anh)) vi cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y tang) OR (6 tang)) dai hoc. hieu ve cham xuc ((van hanh) OR (van anh)) vi cua tuc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y tang) OR (6 tang)) dai hoc. hieu ve cham xuc ((van hanh) or (van anh)) vi cua tuc".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y tang) OR (6 tang)) dai hoc. hieu ve cham xuc ((van hanh) or (van anh)) vi cua tuc*.