Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thu sach » tu sach, thuoc sach, thu hoach
trinh hu » trinh chu, trinh tu, trinh he
nang xa » nang x, lang xa, nang ma
ca viet » va viet, co viet, hoa viet
y nang » ky nang, ly nang, v nang
va nam » van nam, ha nam
va nay » va ngay, va cay
tu lap » truc lap
hu ca » hu cua, ho ca

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 xa hoi. hieu ((va nam) or (va nay)) tu lap trinh hu ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) y nang xa hoi. hieu ((va nam) OR (va nay)) tu lap trinh hu ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuat sach)) y nang xa hoi. hieu ((va nam) or (va nay)) tu lap trinh hu ca viet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuat sach)) y nang xa hoi. hieu ((va nam) or (va nay)) tu lap trinh hu ca viet*.