Perhaps you should try some spelling variations:
hanh gian » thanh gian, thanh giang, manh giang
gian cua » gian xu, ban cua
doc sach » hoc sach, toc sach, nuoc sach
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
va phan » van phan, va phat, va phap
duc van » duc va, duc tan, duc manh
ve phan » ke phan, ve phat, vi phan
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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) or (doc sach)) ky nang ma hoi. hieu ((ve phan) OR (va phan)) duc van hanh gian cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (doc sach)) ky nang ma hoi. hieu ((ve phan) OR (va phan)) duc van hanh gian cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (doc sach)) ky nang ma hoi. hieu ((ve phan) OR (va phan)) duc van hanh gian cua tre*".