Perhaps you should try some spelling variations:
van xanh » van anh, van hanh, van manh
tran van » luan van
su sach » so sach, vu sach
van hac » van hoc, van ha, van hai
sach ly » sach y, sach lo, sach ty
van bac » van ban, van bao, dan bac
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ly nang ma hoa. hieu ((van bac) or (van hac)) tran van xanh ((di cua) or (de cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ma hoa. hieu ((van bac) OR (van hac)) tran van xanh ((di cua) OR (de cua)) tre.
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ma hoa. hieu ((van bac) or (van hac)) tran van xanh ((di cua) or (de cua)) tre*.