Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
so sach » so sanh, bo sach, co sach
cao hoa » cao hoat, cao khoa, cau hoa
hieu ve » hieu va, hieu van
cac tac » cac toc, cac bac, cac dac
tac van » tac vang, cac van, tac va
ve cac » va cac, vien cac
vi cua » vai cua
di cua » dai cua, doi cua, de 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) or (so sach)) ky nang cao hoa. hieu ve cac tac van hanh ((vi cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (so sach)) ky nang cao hoa. hieu ve cac tac van hanh ((vi cua) OR (di cua)) tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (so sach)) ky nang cao hoa. hieu ve cac tac van hanh ((vi cua) or (di cua)) tre*.