Perhaps you should try some spelling variations:
ty ngang » ly ngan, te ngan, tu ngan
luc tuan » luc luan, luc quan, luu tuan
han viet » san viet, van viet, dan viet
te sach » toc sach
sach ty » sach y, sach tu, sach thu
cho hoc » khoa hoc
cac luc » cau luc, coc luc, cac nuoc
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 sach ty ngang ((cho hoc) OR (co hoc)). lieu va cac luc tuan ((anh viet) or (han viet)) cua cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ngang ((cho hoc) OR (co hoc)). lieu va cac luc tuan ((anh viet) OR (han viet)) cua cay*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ngang ((cho hoc) OR (co hoc)). lieu va cac luc tuan ((anh viet) or (han viet)) cua cay*".