Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te cach » te sach, tu cach, te cac
ve cach » va cach, ve cac, ve canh
tu danh » tu hanh, te danh, tu manh
cho hoc » co hoc, khoa hoc
cac xuc » cam xuc, cac nuoc, chat xuc
vai cua » dai cua, hai cua, lai cua
cua cay » cua cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te cach) OR (ve cach)) tu danh cho hoc. lieu va cac xuc ((van hanh) or (van minh)) vai cua cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te cach) OR (ve cach)) tu danh cho hoc. lieu va cac xuc ((van hanh) OR (van minh)) vai cua cay*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te cach) OR (ve cach)) tu danh cho hoc. lieu va cac xuc ((van hanh) or (van minh)) vai cua cay*".