Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thu sach » tu sach, thuoc sach, thu hoach
va trien » va truyen, va thiet, va tuyen
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
duc van » duc va, duc manh, duc phan
minh cu » minh cau, dinh cu, minh tu
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho
cu va » cuu va, tu va, su va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (thuat sach)) y nang x hoi. hieu va pham ((duc van) OR (duc tan)) minh cu va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) y nang x hoi. hieu va pham ((duc van) OR (duc tan)) minh cu va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuat sach)) y nang x hoi. hieu va pham ((duc van) OR (duc tan)) minh cu va trien".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuat sach)) y nang x hoi. hieu va pham ((duc van) OR (duc tan)) minh cu va trien*.