Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
trung ha » trung hoc, trung tam, trung cap
hanh vai » hanh vi, hanh va, hanh tai
chat duc » chat xuc, chat doc, chet duoc
tang ha » lang ha, tang ma, tang van
vai cua » dai cua, hai cua, lai cua
sai kho » dai kho, tai khoa, dai khoa
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
duc van » duc va, duc tan, duc manh
tu sai » tu bai, tu san, tu cai
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai kho ((tang ha) OR (trung ha)) hoi. hieu va chat duc van hanh vai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai kho ((tang ha) OR (trung ha)) hoi. hieu va chat duc van hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sai kho ((tang ha) OR (trung ha)) hoi. hieu va chat duc van hanh vai cua te*.