Perhaps you should try some spelling variations:
phan duc » pham duc, phan tu, phan dau
gian cua » gian xu, ban cua
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
via cua » gia cua, giau cua, rija cua
duc van » duc va, duc tan, duc manh
ve phan » va phan, ke phan, ve phat
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
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 (toc sach)) ky nang ma hoi. hieu ve phan duc van hanh ((via cua) OR (gian cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky nang ma hoi. hieu ve phan duc van hanh ((via cua) OR (gian cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky nang ma hoi. hieu ve phan duc van hanh ((via cua) OR (gian cua)) tre*".