Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
tinh chuan » trinh chuan, tinh chua, tieu chuan
hoc thuat » hoc thuyet, hoc thuc, hoc chat
manh tinh » man tinh, manh binh, canh tinh
dung cong » dung trong
thang ban » hang ban, tang ban, thanh ban
ban can » ban dan, ban hang, ban hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thuat lanh - manh tinh chuan ((dung cong) or (dang cong)) thang ban can~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thuat lanh - manh tinh chuan ((dung cong) OR (dang cong)) thang ban can.
• Adding a wildcard symbol may retrieve word variants: hoc thuat lanh - manh tinh chuan ((dung cong) or (dang cong)) thang ban can*.