Perhaps you should try some spelling variations:
thu hanh » thuc hanh, thu thanh, thuy hanh
thai cua » than cua, tai cuc, tri cua
cac tac » cac toc, cac bac, cac dac
ban cua » ban quan
va danh » va dinh, va dan, va hanh
hanh ky » hanh kem
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, mang may
tac va » tac da, tac xa, tuc va
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu hanh ky ((nang ma) OR (nang cao)) hoa. hieu ve cac tac va danh ((ban cua) or (thai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu hanh ky ((nang ma) OR (nang cao)) hoa. hieu ve cac tac va danh ((ban cua) OR (thai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu hanh ky ((nang ma) OR (nang cao)) hoa. hieu ve cac tac va danh ((ban cua) or (thai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu hanh ky ((nang ma) OR (nang cao)) hoa. hieu ve cac tac va danh ((ban cua) or (thai cua)) tre*.